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Parasitic Copepods of Mackerel - and Tuna-like Fishes (Scombridae ...
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<strong>Parasitic</strong> <strong>Copepods</strong> <strong>of</strong> <strong>Mackerel</strong> -<br />
<strong>and</strong> <strong>Tuna</strong>-<strong>like</strong> <strong>Fishes</strong><br />
(<strong>Scombridae</strong>)<br />
<strong>of</strong> the World<br />
ROGER CRESSEY<br />
<strong>and</strong><br />
HILLARY BOYLE CRESSEY<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 311
SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTION<br />
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Secretary<br />
Smithsonian Institution
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 311<br />
<strong>Parasitic</strong> <strong>Copepods</strong> <strong>of</strong> <strong>Mackerel</strong><br />
<strong>and</strong> <strong>Tuna</strong>-<strong>like</strong> <strong>Fishes</strong><br />
(<strong>Scombridae</strong>)<br />
<strong>of</strong> the World<br />
Roger Cressey<br />
<strong>and</strong><br />
Hillary Boyle Cressey<br />
SMITHSONIAN INSTITUTION PRESS<br />
City <strong>of</strong> Washington<br />
1980
ABSTRACT<br />
Cressey, Roger, <strong>and</strong> Hillary Boyle Cressey. <strong>Parasitic</strong> <strong>Copepods</strong> <strong>of</strong> <strong>Mackerel</strong>- <strong>and</strong><br />
<strong>Tuna</strong>-<strong>like</strong> <strong>Fishes</strong> (<strong>Scombridae</strong>] <strong>of</strong> the World. Smithsonian Contributions to Zoology,<br />
number 311, 186 pages, 139 figures, 1980.—Forty-six species <strong>of</strong> parasitic copepods<br />
(one new genus, 8 new species) are reported from all known 46 species <strong>of</strong> <strong>Scombridae</strong><br />
subfamily Scombrinae from the world. Literature records are included only where<br />
host <strong>and</strong>/or copepod identifications could be verified. Copepod families include:<br />
Bomolochidae; Shiinoidae; Caligidae; Euryphoridae; Tuxophoridae; Pseudocycnidae;<br />
Lernanthropidae; Lerneopodidae. The new bomolochid genus is Unicolax. The new<br />
species are U. collaterals, U. ciliatus, U. reductus, Holobomolochus divaricatus, H.<br />
nudiusculus, <strong>and</strong> H. asperatus (Bomolochidae) ; Caligus omissus (Caligidae) ; <strong>and</strong><br />
Tuxophorus collettei (Tuxophoridae). The genus Pseudocynopsis Yamaguti has<br />
been placed in synonymy with Pseudocycnoides Yamaguti. Lists are included <strong>of</strong> all<br />
species <strong>of</strong> the Scombrinae <strong>and</strong> their geographic distribution, copepods parasitic on<br />
each scombrid species with the relative abundance <strong>of</strong> each copepod species on each<br />
host species, <strong>and</strong> the scombrid hosts for each copepod species indicating host<br />
preferences.<br />
OFFICIAL PUBLICATION DATE is h<strong>and</strong>stamped in a limited number <strong>of</strong> initial copies <strong>and</strong> is<br />
recorded in the Institution's annual report, Smithsonian Year. SERIES COVER DESIGN : The<br />
coral Montastrea cavernosa (Linnaeus).<br />
Library <strong>of</strong> Congress Cataloging in Publication Data<br />
Cressey Roger F 1930-<br />
<strong>Parasitic</strong> copepods <strong>of</strong> mackerel- <strong>and</strong> tuna-<strong>like</strong> fishes (<strong>Scombridae</strong>) <strong>of</strong> the world.<br />
(Smithsonian contributions to zoology ; no. 311)<br />
Bibliography: p.<br />
Supt. <strong>of</strong> Docs, no.: SI 1.27:311<br />
1. Copepoda. 2. Parasites—<strong>Fishes</strong>. 3. <strong>Scombridae</strong>—Diseases. 4. <strong>Fishes</strong>—Diseases. I. Cressey,<br />
Hillary Boyle, 1949- joint author. II. Title. III. Series: Smithsonian Institution.<br />
Smithsonian contributions to zoology ; no. 311.<br />
QL1.S54 no. 311 [QL444.C7] 591'.08s [595'.34'04524] 79-20297
Contents<br />
Introduction 1<br />
Known Host Species with Distribution 2<br />
Specimens Examined 3<br />
Acknowledgments 3<br />
Holobomolochus Vervoort, 1969 4<br />
Holobomolochus divaricatus, new species 4<br />
Holobomolochus nudiusculus, new species 6<br />
Holobomolochus asperatus, new species 7<br />
Discussion 8<br />
Unicolax, new genus 8<br />
Unicolax collateralis, new species 8<br />
Unicolax anonymous (Vervoort, 1965), new combination 11<br />
Unicolax mycterobius (Vervoort, 1965), new combination 13<br />
Unicolax ciliatus, new species 15<br />
Unicolax reductus, new species 17<br />
Ceratacolax Vervoort, 1965 18<br />
Ceratacolax euthynni Vervoort, 1965 18<br />
Nothobomolochus Vervoort, 1962 19<br />
Nothobomolochus kanagurta (Pillai, 1965), new combination 19<br />
Orbitacolax Shen, 1957 20<br />
Orbitacolax aculeatus (Pillai, 1962), new combination 20<br />
Pumiliopes Shen, 1957 20<br />
Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, 1973 20<br />
Shiinoa Kabata, 1968 21<br />
Shiinoa inauris Cressey, 1975 21<br />
Shiinoa occlusa Kabata, 1968 22<br />
Caligus Miiller, 1785 22<br />
Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, 1861 22<br />
Caligus regalis Leigh-Sharpe, 1930 23<br />
Caligus productus Dana, 1852 24<br />
Caligus asymmetricus Kabata, 1965 25<br />
Caligus bonito Wilson, 1905 26<br />
Caligus mutabilis Wilson, 1905 27<br />
Caligus omissus, new species 28<br />
Caligus biseriodentatus Shen, 1957 29<br />
Discussion 31<br />
Caligus cybii Bassett-Smith, 1898 31<br />
Caligus pelamydis Kroyer, 1863 32<br />
Caligus infestans Heller, 1868 33<br />
Caligus diaphanus Nordmann, 1832 34<br />
iii<br />
Page
iv SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Page<br />
Caligus savala Gnanamuthu, 1948 35<br />
Caligus macarovi Gussev, 1951 35<br />
Caligus amblygenitalis Pillai, 1961 36<br />
Caligus pseudokalumai Lewis, 1968 36<br />
Elytrophora Gerstaecker, 1853 36<br />
Elytrophora brachyptera Gerstaecker, 1853 36<br />
Elytrophora indica Shiino, 1958 37<br />
Gloiopotes Steenstrup <strong>and</strong> Liitken, 1861 38<br />
Gloiopotes hygomianus Steenstrup <strong>and</strong> Liitken, 1861 38<br />
Caligulus Heegaard, 1962 38<br />
Caligulus longispinosus Heegaard, 1962 38<br />
Tuxophorus Wilson, 1908 39<br />
Tuxophorus cybii Nunes-Ruivo <strong>and</strong> Fourmanoir, 1956 39<br />
Tuxophorus cervicornis Heegaard, 1962 39<br />
Tuxophorus collettei, new species 39<br />
Pseudocycnus Heller, 1868 41<br />
Pseudocycnus appendiculatus Heller, 1968 41<br />
Pseudocycnoides Yamaguti, 1963 42<br />
Pseudocycnoides armatus (Bassett-Smith, 1898) 42<br />
Pseudocycnoides scomberomori (Yamaguti, 1939) 43<br />
Pseudocycnoides buccata (Wilson, 1922), new combination 43<br />
Lernanthropus Blainville, 1822 44<br />
Lernanthropus kanagurta Tripathi, 1962 44<br />
Brachiella Cuvier, 1830 45<br />
Brachiella thynni Cuvier, 1830 45<br />
Brachiella magna Kabata, 1968 45<br />
Clavellisa Wilson, 1915 45<br />
Clavellisa scombri (Kurz, 1877) 45<br />
Clavellopsis Wilson, 1915 45<br />
Clavellopsis saba Yamaguti, 1939 45<br />
Pennella Oken, 1816 46<br />
Pennella species 46<br />
Summary 46<br />
Literature Cited 51<br />
Figures 54
<strong>Parasitic</strong> <strong>Copepods</strong> <strong>of</strong> <strong>Mackerel</strong><strong>and</strong><br />
<strong>Tuna</strong>-<strong>like</strong> <strong>Fishes</strong><br />
(<strong>Scombridae</strong>)<br />
<strong>of</strong> the World<br />
Introduction<br />
There are 47 currently recognized species <strong>of</strong> the<br />
family <strong>Scombridae</strong>; plus an additional new species <strong>of</strong><br />
Scomberomorus being described by Collette <strong>and</strong> Russo.<br />
One species, Gasterochisma melampus Richardson, is<br />
placed in a separate subfamily <strong>and</strong> has not been considered<br />
in this study. For approximately the last 20<br />
years the first author has been collecting <strong>and</strong> receiving<br />
collections <strong>of</strong> the copepods parasitic on these fishes.<br />
Of the 46 species <strong>of</strong> parasitic copepods reported here,<br />
40 species are represented in our collections. These<br />
40 species have been collected from 2422 individual<br />
fish from all 46 species <strong>of</strong> Scombrinae. As a result <strong>of</strong><br />
this exhaustive collection we have presented a comprehensive<br />
account <strong>of</strong> the copepods parasitic on tunas<br />
<strong>and</strong> tuna-related fishes.<br />
Our primary objective has been to produce a baseline<br />
study <strong>of</strong> the copepods parasitic on scombrid fishes.<br />
Because <strong>of</strong> the unreliability <strong>of</strong> most past literature it<br />
has been impossible to assess the host-parasite relationship,<br />
especially the degree <strong>of</strong> host specificity. By compiling<br />
a comprehensive collection such as we report<br />
Roger Cressey <strong>and</strong> Hillary Boyle Cressey, Department <strong>of</strong><br />
Invertebrate Zoology, National Museum <strong>of</strong> Natural History,<br />
Smithsonian Institution, Washington, D.C. 20560.<br />
Roger Cressey<br />
<strong>and</strong> Hillary Boyle Cressey<br />
here, resolving problems <strong>of</strong> synonymy with several<br />
copepod species, <strong>and</strong> working closely with scombrid<br />
taxonomists (R. H. Gibbs <strong>and</strong> B. B. Collette) to assure<br />
proper host identifications, we feel we have reached<br />
that objective. We do not feel that we have produced<br />
a definitive work, but hopefully, a solid foundation to<br />
which information in future collections can be added.<br />
Previous works by Lewis, Kabata, Shiino, <strong>and</strong> Pillai<br />
concerned with scombrid copepods are excellent <strong>and</strong><br />
we have included some <strong>of</strong> their information where it<br />
fills gaps in our own collection data. For reasons stated<br />
above, however, we have not considered most <strong>of</strong> the<br />
earlier works in our host-parasite data.<br />
Because most species <strong>of</strong> scombrid fishes are commercially<br />
important, various aspects <strong>of</strong> their biology have<br />
been investigated for several years. One result <strong>of</strong> this<br />
interest has been the many reports <strong>of</strong> copepods parasitic<br />
on them since the last century. The major failing<br />
in this, however, has been the general lack <strong>of</strong> cooperative<br />
effort between parasitologists <strong>and</strong> ichthyologists.<br />
Too <strong>of</strong>ten, the copepod worker has been content to<br />
repeat unverified host identifications or unreliable<br />
common names. This casual approach to that aspect<br />
<strong>of</strong> the record has resulted in an account too confusing<br />
to be <strong>of</strong> much value in determining true relationships<br />
between the copepod species <strong>and</strong> their hosts. Except<br />
for a literature compilation by Silas <strong>and</strong> Ummerkutty
in 1967, no attempt has been made to critically<br />
examine the scombrid parasites in a comprehensive<br />
way to determine the taxonomic status <strong>of</strong> most <strong>of</strong> the<br />
described species. For example, Silas <strong>and</strong> Ummerkutty<br />
list 29 species <strong>of</strong> Caligus as reported parasites <strong>of</strong> the<br />
Scombrinae. As a result <strong>of</strong> our examinations <strong>of</strong> typespecimens<br />
<strong>of</strong> a number <strong>of</strong> these Caligus species, <strong>and</strong><br />
the data based on our own collections, we have been<br />
able to place almost half <strong>of</strong> these in synonymy <strong>and</strong><br />
reduce the number <strong>of</strong> Caligus species from these hosts<br />
to 15.<br />
We have included literature records in our data<br />
only in those cases where we could verify the host<br />
<strong>and</strong>/or the copepod identification. To include unverified<br />
collections would serve no useful purpose <strong>and</strong> only<br />
cloud the host-parasite relationship. It was with this<br />
in mind that we waited until our collections were as<br />
complete as reasonably possible to publish our results.<br />
We have, with each species, given a skeleton synonymy<br />
to provide a brief historical account <strong>of</strong> each. A complete<br />
synopsis <strong>of</strong> the species <strong>of</strong> Caligus was recently<br />
published by Margolis, Kabata, <strong>and</strong> Parker (1975)<br />
but a complete revision <strong>of</strong> the genus is badly needed.<br />
There are slightly over 200 currently recognized species<br />
<strong>of</strong> Caligus. Reducing the 29 species cited by Silas<br />
<strong>and</strong> Ummerkutty to 15 illustrates the extent <strong>of</strong> the<br />
problem. Extrapolating from that reduction <strong>of</strong> 29<br />
species to 15, it would not be unreasonable to expect<br />
that a generic revision might result in only 100 or so<br />
Caligus species as valid.<br />
The first author <strong>and</strong> B. B. Collette are planning a<br />
joint paper summarizing the host-parasite relationship<br />
from both ecological <strong>and</strong> evolutionary st<strong>and</strong>points.<br />
We feel that this aspect can best be done separately<br />
<strong>and</strong> in conjunction with a scombrid specialist<br />
(Collette). In addition to collections made by us,<br />
most <strong>of</strong> the other collections (about one-third <strong>of</strong> the<br />
total) were made by Collette in the course <strong>of</strong> his<br />
studies on scombrids.<br />
KNOWN HOST SPECIES WITH DISTRIBUTION.—Below<br />
is a list <strong>of</strong> the known species <strong>of</strong> the scombrid subfamily<br />
Scombrinae with their general geographic distributions.<br />
Although there are 2 recognized species <strong>of</strong><br />
Auxis, we were advised (B. B. Collette, pers. com.)<br />
that, for purposes <strong>of</strong> this study, we should refer to<br />
them as "Auxis species" until the genus has undergone<br />
revision. References to "Scomberomorus species" pertain<br />
to a new species from Northern Australia to New<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Guinea being described by Collette <strong>and</strong> Russo. The<br />
following list is adapted from information in Collette<br />
<strong>and</strong>Chao (1975) <strong>and</strong> Klawe (1977).<br />
Tribe SCOMBRINI Bonaparte (<strong>Mackerel</strong>s)<br />
Rastrelliger brachysoma (Bleeker) : South China Sea east<br />
to Fiji<br />
Rastrelliger faughni Matsui: South China Sea to Indonesia<br />
Rastrelliger kanagurta (Cuvier): Indian <strong>and</strong> South Central<br />
Pacific oceans<br />
Scomber australasicus (Cuvier) : Western & Central Pacific<br />
<strong>and</strong> Socorro Isl<strong>and</strong> (<strong>of</strong>f Mexico)<br />
Scomber japonicus Houttuyn: circumglobal antitropical<br />
Scomber scombrus Linnaeus: North Atlantic Ocean <strong>and</strong><br />
Mediterranean<br />
Tribe SCOMBEROMORINI Starks (Seerfishes)<br />
Acanthocybium sol<strong>and</strong>ri (Cuvier): circutntropical <strong>and</strong> subtropical<br />
Granimatorcynus bicarinatus (Quoy <strong>and</strong> Gaimard): Red Sea<br />
<strong>and</strong> Western Pacific Ocean<br />
Scomberomorus brasiliensis Collette, Russo, <strong>and</strong> Zavala-<br />
Camin: Western Atlantic (Yucatan to south Brazil)<br />
Scomberomorus cavalla (Cuvier): Tropical western Atlantic<br />
Ocean<br />
Scomberomorus commerson (Lacepede): Indian <strong>and</strong> Western<br />
Pacific oceans<br />
Scomberomorus concolor (Lockington): Gulf <strong>of</strong> California<br />
<strong>and</strong> Monterey Bay<br />
Scomberomorus guttatus (Bloch <strong>and</strong> Schneider): Indian <strong>and</strong><br />
western Pacific oceans<br />
Scomberomorus koreanus (Kishinouye): Indian <strong>and</strong> western<br />
Pacific oceans<br />
Scomberomorus lineolatus (Cuvier): India to Indonesia<br />
Scomberomorus maculatus (Mitchill): Western Atlantic<br />
(Yucatan to Massachusetts)<br />
Scomberomorus multiradiatus Munro: Gulf <strong>of</strong> Papua<br />
Scomberomorus niphonius (Cuvier): Northwestern Pacific<br />
Ocean (China to Japan)<br />
Scomberomorus plurilineatus Fourmanoir: Mozambique<br />
Channel (coastal) <strong>and</strong> South Africa<br />
Scomberomorus queensl<strong>and</strong>icus Munro: Northern Australia<br />
Scomberomorus regalis (Bloch): Western Atlantic (especially<br />
West Indies)<br />
Scomberomorus semifasciatus (Macleay): Northern Australia<br />
to New Guinea<br />
Scomberomorus sierra Jordan <strong>and</strong> Starks: Eastern Pacific<br />
Ocean<br />
Scomberomorus sinensis (Lacepede): Northwestern Pacific<br />
Ocean<br />
Scomberomorus tritor (Cuvier): Gulf <strong>of</strong> Guinea to Mediterranean<br />
Scomberomorus species: Northern Australia to New Guinea
NUMBER 3 1 1<br />
Tribe SARDINI Jordan <strong>and</strong> Evermann (Bonitos)<br />
Allothunnus fallai Serventy: circumglobal in southern hemisphere<br />
Cybiosarda elegans (Whitley): Northern Australia to New<br />
Guinea<br />
Gymnosarda unicolor (Riippell) : Indian to central Pacific<br />
oceans<br />
Orcynopsis unicolor (Ge<strong>of</strong>froy St. Hilaire): Gulf <strong>of</strong> Guinea<br />
to Mediterraean<br />
Sarda australis (Macleay): southeast coast <strong>of</strong> Australia<br />
Sarda chiliensis (Cuvier), 2 subspecies: Northeastern (S. c.<br />
lineolata) <strong>and</strong> southeastern Pacific Ocean (S. c. chiliensis)<br />
Sarda orientalis (Temminck <strong>and</strong> Schlegel): Indian <strong>and</strong><br />
Pacific oceans (coastal)<br />
Sarda sarda (Bloch): Atlantic Ocean <strong>and</strong> Mediterranean<br />
Tribe THUNNINI Starks (<strong>Tuna</strong>s)<br />
Auxis rochei (Risso) : circumtropical<br />
Auxis thazard Lacepede: circumtropical<br />
Euthynnus affinis (Cantor): Indian <strong>and</strong> Pacific oceans<br />
Euthynnus alletteratus (Rafinesque): Atlantic Ocean<br />
Euthynnus lineatus Kishinouye: Eastern Pacific Ocean<br />
Katsuwonus pelamis (Linnaeus): circumtropical<br />
Thunnus alalunga (Bonnaterre): circumtemperate <strong>and</strong><br />
tropical<br />
Thunnus albacares (Bonnaterre): circumsubtropical <strong>and</strong><br />
tropical<br />
Thunnus atlanticus (Lesson): Western Atlantic Ocean<br />
Thunnus maccoyii (Castelnau): circumglobal in southern<br />
hemisphere<br />
Thunnus obesus (Lowe): circumsubtropical <strong>and</strong> tropical<br />
Thunnus thynnus (Linnaeus): North Pacific, North <strong>and</strong><br />
South Atlantic (non-tropical)<br />
Thunnus tonggol (Bleeker): Indian <strong>and</strong> Western Pacific<br />
SPECIMENS EXAMINED.—Scombrids housed in or<br />
borrowed from the following places were examined<br />
for copepods by us or Collette.<br />
Australian Museum, Sydney (AMS)<br />
Academy <strong>of</strong> Natural Sciences, Philadelphia, Pa.<br />
British Museum (Natural History), London<br />
Bernice P. Bishop Museum, Honolulu, Hawaii<br />
California Academy <strong>of</strong> Sciences, San Francisco<br />
Chesapeake Biological Laboratory, Solomons, Md.<br />
CSIRO Marine Biological Laboratory, Cronulla, N.S.W.,<br />
Australia<br />
Dominion Museum, Wellington, New Zeal<strong>and</strong><br />
Field Museum <strong>of</strong> Natural History, Chicago, 111.<br />
Hebrew University, Jerusalem<br />
Los Angeles County Museum <strong>of</strong> Natural History, Los<br />
Angeles, Calif.<br />
Museo Argentina de Ciencias Naturales, Buenos Aires<br />
Museum <strong>of</strong> Comparative Zoology, Harvard (MCZ)<br />
Muslum National d'Histoire Naturelle, Paris<br />
Museo di Storia Naturale, Genoa<br />
Museo de La Specola, Universita di Firenze, Florence<br />
Naturhistorisches Museum, Vienna<br />
National Museum <strong>of</strong> Natural Sciences, Ottawa<br />
Northwest Fisheries Center Auke Bay Laboratory, National<br />
Marine Fisheries Service, NOAA, Auke Bay, Alaska<br />
Queensl<strong>and</strong> Museum, Brisbane<br />
Rijksmuseum van Naturlijke Histoire, Leiden<br />
J.L.B. Smith Institute <strong>of</strong> Ichthyology, Rhodes University,<br />
Grahamstown<br />
South African Museum, Cape Town<br />
Sea Fisheries Research Station, Haifa, Israel<br />
Scripps Institution <strong>of</strong> Oceanography, La Jolla, Calif.<br />
Senckenberg Museum, Frankfurt-am-Main<br />
Southeast Fisheries Center, National Marine Fisheries Service,<br />
NOAA (formerly Tropical Atlantic Biological Laboratory),<br />
Miami, Fla.<br />
Institute <strong>of</strong> Fisheries, University <strong>of</strong> British Columbia, Vancouver<br />
University <strong>of</strong> California, Los Angeles<br />
Rosenstiel School <strong>of</strong> Marine <strong>and</strong> Atmospheric Science,<br />
Miami, Fla.<br />
University <strong>of</strong> Michigan Museum <strong>of</strong> Zoology, Ann Arbor<br />
Smithsonian Institution, Washington, D.C. (USNM, former<br />
United States National Museum, collections in the National<br />
Museum <strong>of</strong> Natural History, Smithsonian Institution)<br />
Western Australia Museum, Perth<br />
Woods Hole Oceanographic Institution, Woods Hole, Mass.<br />
Zoological Museum, Copenhagen<br />
Zoological Museum, Oslo<br />
Representative collections <strong>of</strong> the following species<br />
will be deposited in the British Museum (Natural History,<br />
London), Museum National d'Histoire Naturelle<br />
(Paris), Australian Museum (Sydney), <strong>and</strong> California<br />
Academy <strong>of</strong> Sciences (San Francisco): Holobomolochus<br />
divaricatus, H. nudiusculus, Unicolax collateral!*,<br />
U. reductus, U. ciliatus, Ceratacolax euthynni, Shiinoa<br />
inauris, S. occlusa, Caligus coryphaenae, C. omissus,<br />
C. bonito, C. productus, C. cybii, Elytrophora brachyptera,<br />
E. indica, Pseudocycnus appendiculatus,<br />
Pseudocycnoides armata, <strong>and</strong> P. buccata. All type<br />
material <strong>and</strong> remaining collections are deposited in<br />
the Smithsonian Institution.<br />
ACKNOWLEDGMENTS.—This work began with a<br />
small collection <strong>of</strong> copepods parasitic on western<br />
Atlantic pelagic fishes given to one <strong>of</strong> us (R. Cressey)<br />
by Arthur Humes as a basis for a graduate research<br />
project in 1960. The initial collection was made by<br />
Robert Gibbs <strong>and</strong> Bruce Collette during various<br />
cruises <strong>of</strong> the R. V. Delaware, consisting primarily <strong>of</strong><br />
copepods from sharks <strong>and</strong> scombrids. The shark parasites<br />
formed the basis for R. Cressey's doctoral dissertation<br />
revising the family P<strong>and</strong>aridae (under the
direction <strong>of</strong> A. Humes). The remaining collection<br />
stimulated a continuing interest in scombrid copepods<br />
by the first author <strong>and</strong> later by the second.<br />
We thank the scientists <strong>and</strong> staffs <strong>of</strong> the many<br />
institutions cited above for making fish specimens<br />
available for examination for parasitic copepods.<br />
Through the years many people have sent us material,<br />
for which we are grateful. Outst<strong>and</strong>ing among<br />
these are: Bruce B. Collette (National Marine Fisheries<br />
Service, Washington), Robert H. Gibbs (Smithsonian<br />
Institution, Washington), Arthur G. Humes<br />
(Boston University), Richard Shomora (National<br />
Marine Fisheries Service, Honolulu), <strong>and</strong> Vladimir<br />
Walters (National Marine Fisheries Service, Miami).<br />
Robert Gibbs was our principle consultant concerning<br />
problems in scombrid taxonomy during the early<br />
years <strong>of</strong> the work. Later, Bruce Collette began an<br />
intensive study <strong>of</strong> scombrid taxonomy <strong>and</strong> during the<br />
course <strong>of</strong> his work spent many hours gathering copepods<br />
for us. We extend a special thanks to him for<br />
his enthusiastic <strong>and</strong> continued support<br />
We were assisted in the illustrations by Nancy Zacks<br />
who rendered Figures 75-79 <strong>and</strong> 95 <strong>and</strong> by Michelle<br />
Wilcox who did the illustrations for Figures 82-84.<br />
Cynthia Hemmings assisted in the final preparation<br />
<strong>of</strong> the manuscript. The staff <strong>of</strong> the SEM laboratory<br />
all participated at various times in the preparation <strong>of</strong><br />
the SEM photographs (Walter Brown, Mary Jacque<br />
Mann, <strong>and</strong> Susann Braden). We thank all <strong>of</strong> them<br />
for their assistance.<br />
The manuscript was reviewed by Bruce Collette <strong>and</strong><br />
Brian Kensley <strong>and</strong> we are grateful for their many<br />
helpful suggestions.<br />
Holobomolochus Vervoort, 1969<br />
Holobomolochus divaricatus, new species<br />
FIGURES 1-4, ba-e, 96, 109-113<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172244), allotype $ (USNM 172245) paratypes 11 9<br />
(USNM 172246) from the nasal sinuses <strong>of</strong> Scornberomorus<br />
brasiliensis (USNM 188424) from Brazil.<br />
In addition, there are 13 collections containing 61 $<br />
2$ from S. brasiliensis from Panama (Atlantic),<br />
Colombia (Atlantic), Brazil <strong>and</strong> Argentina; 25 collections<br />
containing 70 $ 40 $ from S. maculatus from<br />
Cape Cod, New Jersey, Maryl<strong>and</strong>, South Carolina,<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Georgia, Florida, Mississippi, Alabama, Louisiana,<br />
Texas, Panama (Atlantic), Surinam; 11 collections<br />
containing 28 9 20 $ <strong>and</strong> 3 immatures from S. regalis<br />
from Florida, Cuba, Haiti, Puerto Rico, Colombia<br />
(Atlantic), Venezuela <strong>and</strong> Surinam. All copepods<br />
were collected from the nasal sinuses <strong>of</strong> the host fish.<br />
FEMALE.—Body form as in Figure la. Total length<br />
2.62 mm, greatest width (widest part <strong>of</strong> cephalon)<br />
1.20 mm. Genital segment (Figure \b) wider than<br />
long (348 X 483 jxm) with 3 dorsal setae at area <strong>of</strong><br />
egg sac attachment. Abdomen 3-segmented, segments<br />
measuring (1 X w) 224 X 318 /*m, 153 X 265 ^m,<br />
147 X 230 /*m respectively; ventral surface <strong>of</strong> last<br />
segment with 2 patches <strong>of</strong> prominent spinules (see<br />
figure \c). Caudal rami (Figure \c) longer than wide<br />
(129 X 94 /*m) with six setae; longest seta 590 /*m.<br />
First antenna (Figure Id) 5-segmented, second segment<br />
incompletely divided; first two segments with 15<br />
prominent plumose setae; segments 4 <strong>and</strong> 5 with one<br />
aesthete each. Second antenna (Figure 2a) <strong>of</strong> usual<br />
bomolochid type; terminal segment with numerous<br />
rows <strong>of</strong> spinules, 2 processes with spinules, 3 terminal<br />
setae <strong>and</strong> 4 elongate spines. M<strong>and</strong>ible, paragnath,<br />
first maxilla <strong>and</strong> second maxilla as in Figure 2b.<br />
Maxilliped (Figure 2c) terminal segment with prominent<br />
curved claw with slight projection on outer curve,<br />
<strong>and</strong> 3 plumose setae; basal segment with 1 plumose<br />
seta.<br />
Leg 1 (Figure 2d) exopod with stout, heavily plumose<br />
seta on outer corner; basipod with 2 patches <strong>of</strong><br />
hairs; exopod 2-segmented, first segment with prominent<br />
rugose spine on outer distal corner, second segment<br />
with small spine at outer proximal comer,<br />
minute spine at outer distal corner <strong>and</strong> 2 stout flagellated<br />
spines best viewed dorsally, terminal to inner<br />
edge <strong>of</strong> segment with 6 plumose setae; endopod<br />
3-segmented, first segment with large patch <strong>of</strong> hairs<br />
<strong>and</strong> inner seta, second segment with smaller patch <strong>of</strong><br />
hairs <strong>and</strong> inner seta, third segment with 5 terminal<br />
setae, all setae heavily plumose, outer edge <strong>of</strong> endopod<br />
segments haired. Legs 2-4 biramous, rami 3-segmented.<br />
Leg 2 (Figure 2e) coxopod with short row <strong>of</strong> spinules<br />
at outer distal corner; basipod with dorsal seta; exopod<br />
first segment with hairs on outer edge <strong>and</strong> spine on<br />
outer distal corner, second segment with inner seta<br />
<strong>and</strong> outer spine, slender spinules at base <strong>of</strong> spine, third<br />
segment with 6 inner to terminal setae <strong>and</strong> 3 outer<br />
spines; exopod spines broad at base, tapering distally<br />
with small terminal flagellum, fine hairs on both
NUMBER 3 1 1<br />
edges <strong>of</strong> spines; endopod first segment with inner<br />
seta <strong>and</strong> row <strong>of</strong> fine hairs along outer half <strong>of</strong> distal<br />
border, second segment similar except with 2 inner<br />
setae, third segment with 3 inner to terminal seta <strong>and</strong><br />
2 outer spines similar to, but smaller than, exopod<br />
spines, outer edges <strong>of</strong> endopod segments haired; interpodal<br />
plate with long slender spinules. Leg 3 (Figure<br />
3a) coxopod with row <strong>of</strong> small spinules at outer distal<br />
corner; basipod with dorsal seta; exopod segments<br />
heavily sclerotized; first segment with outer spine,<br />
second segment with outer spine <strong>and</strong> inner seta, third<br />
segment with 2 outer spines <strong>and</strong> 6 terminal to inner<br />
setae, exopod spines heavily sclerotized, spines on<br />
second <strong>and</strong> third segments <strong>of</strong> about equal length,<br />
spine on first segment slightly shorter than others;<br />
endopod similar to leg 2 except third segment with<br />
only 2 setae; interpodal plate with short, stout spinules.<br />
Leg 4 (Figure 3b) coxopod <strong>and</strong> basipod similar to<br />
leg 3; exopod first segment with spinules along ventrolateral<br />
edge, hairs on inner edge <strong>and</strong> spine on outer<br />
distal corner, second segment with inner seta <strong>and</strong><br />
outer spine, slender spinules at base <strong>of</strong> seta, shorter,<br />
stouter spinules at base <strong>of</strong> spine, third segment with<br />
6 inner to terminal setae, 2 outer spines, slender<br />
spinules at bases <strong>of</strong> 2 innermost setae, stouter spinules<br />
at bases <strong>of</strong> spines, spines slender, elongate with fine<br />
hair on edges <strong>and</strong> fine terminal flagellum; endopod<br />
first segment with patch <strong>of</strong> slender spinules near outer<br />
distal corner <strong>and</strong> inner seta spinulose along distal twothirds,<br />
second segment similar to first, third segment<br />
elongate, broadened distally with 2 terminal patches<br />
<strong>of</strong> stout spinules <strong>and</strong> 2 spines flanking terminal seta,<br />
spines elongate, <strong>of</strong> about equal length <strong>and</strong> finely haired<br />
on edges, seta spinulose along distal half; interpodal<br />
plate with short, stout spinules. Leg 5 (Figure 3c)<br />
basal segment with dorsal seta <strong>and</strong> small patch <strong>of</strong><br />
slender spinules; free segment with 3 patches <strong>of</strong><br />
slender spinules, one spine at about mid-point <strong>of</strong> outer<br />
margin <strong>and</strong> 2 spines flanking terminal, naked seta,<br />
spines elongate, simple with finely haired edges. Leg<br />
6 (see Figure 16) represented by 3 naked setae at<br />
area <strong>of</strong> egg sac attachment.<br />
MALE.—Body form as in Figure 3d. Total length<br />
1.18mm, greatest width 0.50mm (measured at widest<br />
part <strong>of</strong> cephalon). Genital segment (Figure 4a) longer<br />
than wide (236 X 182 pm). Abdomen (Figure 4a)<br />
2-segmented, segments measure (length X width)<br />
88 X 118 /un, 82 X 106 /un, respectively; ventral<br />
surface <strong>of</strong> second segment with 2-3 rows <strong>of</strong> promi-<br />
nent spinules forming a proximal transverse b<strong>and</strong> <strong>and</strong><br />
2 distal patches <strong>of</strong> spinules. Caudal rami (Figure 46)<br />
slightly longer than wide (41 X 35 /an) with 6 setae;<br />
longest seta 572 /tm.<br />
First antenna (Figure 4c) 5-segmented, second segment<br />
incompletely divided, antenna similar to female,<br />
but segments not as elongate. Second antenna, m<strong>and</strong>ible,<br />
paragnath, first maxilla, second maxilla similar to,<br />
but proportionately smaller than, female. Maxilliped<br />
(Figure 4d*) second segment with 2 short setae near<br />
inner mid-margin, inner surface <strong>of</strong> segment with patch<br />
<strong>of</strong> elongate, blunt-tipped spinules <strong>and</strong> patch <strong>of</strong> smaller,<br />
rounder spinules; terminal claw with 2 setae <strong>and</strong><br />
numerous closely spaced "teeth" along entire inner<br />
edge. Legs 1-4 biramous, rami 3-segmented except<br />
leg 4 endopod.<br />
Leg 1 (Figure Ae) coxopod heavily haired along<br />
outer distal edge; basipod with dorsal seta <strong>and</strong> ventral<br />
ornamentation as indicated in figure; exopod first segment<br />
with row <strong>of</strong> elongate spinules near base <strong>of</strong> spine<br />
on outer distal corner, second segment similar to first<br />
with the addition <strong>of</strong> an inner seta, third segment with<br />
4 inner to terminal setae <strong>and</strong> 3 outer spines, proximal<br />
2 spines similar to those <strong>of</strong> first <strong>and</strong> second segments,<br />
finely haired on edges, <strong>and</strong> with terminal flagellum<br />
<strong>and</strong> with row <strong>of</strong> spinules near base, distal spine elongate<br />
with row <strong>of</strong> very fine hairs along outer edge;<br />
endopod first segment enlarged, covering inner portion<br />
<strong>of</strong> exopod, stout hairs along distal edge <strong>and</strong> an inner<br />
seta, second segment only about half as wide as first<br />
segment with inner seta, small spinule on outer distal<br />
corner <strong>and</strong> row <strong>of</strong> fine hairs along outer half <strong>of</strong> distal<br />
edge, third segment with 4 terminal setae <strong>and</strong> small<br />
outer spinule, outer half <strong>of</strong> segment with 2 converging<br />
rows <strong>of</strong> small, rectangular, plate<strong>like</strong> spinules, outer<br />
edges <strong>of</strong> endopod segments heavily haired. Leg 2<br />
coxopod with short row <strong>of</strong> small spinules on outer<br />
distal corner; basipod with dorsal seta; exopod first<br />
segment with irregular rows <strong>of</strong> small bump<strong>like</strong> spinules<br />
along outer edge, short row <strong>of</strong> slender spinules at base<br />
<strong>of</strong> spine on outer distal corner, second segment with<br />
inner seta <strong>and</strong> row <strong>of</strong> spinules at base <strong>of</strong> outer spine,<br />
third segment with 5 inner to terminal setae <strong>and</strong> 3<br />
outer to terminal spines, proximal 2 spines similar to<br />
spines <strong>of</strong> first <strong>and</strong> second segments, finely haired on<br />
edges with terminal flagellum <strong>and</strong> short row <strong>of</strong> spinules<br />
near base, terminal spine elongate with row <strong>of</strong><br />
very fine hairs along outer two-thirds; endopod first<br />
segment with outer seta <strong>and</strong> row <strong>of</strong> hairs along outer
distal edge, second segment similar to first but with<br />
two inner setae, third segment with 3 inner to terminal<br />
setae, short row <strong>of</strong> spinules at base <strong>of</strong> 2 outer spines,<br />
inner spine about twice as long as outer, outer edges<br />
<strong>of</strong> endopod spines heavily haired. Leg 3 (Figure 5a)<br />
similar to leg 2 except endopod third segment with<br />
2 rather than 3 setae. Leg 4 (Figure 56) coxopod<br />
<strong>and</strong> basipod similar to leg 3; exopod similar to leg 3<br />
with the following exceptions: spines more slender;<br />
second segment with no spinules at base <strong>of</strong> outer spine;<br />
third segment with 4 rather than 5 setae; endopod<br />
2-segmented, first segment similar to leg 3, second<br />
segment elongate with stout spinules distally <strong>and</strong> near<br />
outer distal edge, 2 spines flanking naked, terminal<br />
seta, spines spinulose along edges, lacking terminal<br />
flagella, inner spine slightly longer than outer. Leg 5<br />
(Figure 5c) basal segment with dorsal seta <strong>and</strong> small<br />
patch <strong>of</strong> spinules at outer distal corner; free segment<br />
with patch <strong>of</strong> elongate spinules covering inner half <strong>of</strong><br />
lower two-thirds <strong>of</strong> segment, terminally with inner<br />
spinulose spine <strong>and</strong> outer seta.<br />
ETYMOLOGY.—The Latin divaricatus ("spreading<br />
asunder at wide angle") refers to the characteristic<br />
appearance <strong>of</strong> the caudal rami <strong>of</strong> the female.<br />
REMARKS.—Females <strong>of</strong> this species can be distinguished<br />
from all previously described members <strong>of</strong> the<br />
genus by the nature <strong>of</strong> the exopod spines <strong>of</strong> leg 3 (see<br />
Discussion) ; they can be separated from the females <strong>of</strong><br />
the two following species by the ornamentation <strong>of</strong> the<br />
ventral surface <strong>of</strong> the caudal rami <strong>and</strong> last abdominal<br />
segment. Holobomolochus divaricatus females have<br />
two large patches <strong>of</strong> stout spinules on the last abdominal<br />
segment, their caudal rami have no surface ornamentation;<br />
H. nudiusculus females have relatively<br />
small patches <strong>of</strong> minute hairs on the last abdominal<br />
segment; H. asperatus females have 2 large patches<br />
<strong>of</strong> hairs on the last abdominal segment <strong>and</strong> a patch<br />
<strong>of</strong> hairs on the ventral surface <strong>of</strong> each caudal ramus.<br />
In addition the distal spine <strong>of</strong> the third exopod segment<br />
<strong>of</strong> leg 3 is only as long as, or shorter than, the<br />
adjacent spine; in H. nudiusculus <strong>and</strong> H. asperatus<br />
this spine is longer than the adjacent spine <strong>and</strong> more<br />
outwardly curved than other spines <strong>of</strong> the ramus (see<br />
Figures 3a, 6c, 8c).<br />
This copepod is a common parasite on Scomberomorus<br />
brasiliensis, S. maculatus, <strong>and</strong> S. regalis in the<br />
Western Atlantic from Cape Cod to southern Brazil.<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Holobomolochus nudiusculus, new species<br />
FIGURES 5d-e, 6, la-b, 96<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172247), allotype $ (USNM 172248), paratypes<br />
33 5 IS (USNM 172249) from the nasal sinuses <strong>of</strong><br />
Scomberomorus sierra from Buenaventura, Colombia<br />
(USNM 218565). In addition 13 collections containing<br />
30 9 1
NUMBER 3 1 1<br />
ramus (see Figure 76). Caudal rami (Figure 7 b)<br />
longer than wide (47 X 29 /un), each with small<br />
ventral patch <strong>of</strong> slender spinules <strong>and</strong> 6 setae (longest<br />
531 /an).<br />
Cephalic appendages <strong>and</strong> legs 1-5 as in H. divaricatus<br />
male.<br />
ETYMOLOGY.—The Latin nudiusculus ("somewhat<br />
naked") refers to the small patches <strong>of</strong> minute hairs<br />
on the ventral surface <strong>of</strong> the last abdominal segment<br />
<strong>and</strong> the naked surface <strong>of</strong> the female caudal rami.<br />
REMARKS.—Females <strong>of</strong> this species can be distinguished<br />
from H. divaricatus <strong>and</strong> H. asperatus by the<br />
ornamentation <strong>of</strong> the ventral surface <strong>of</strong> the last abdominal<br />
segment. Holobomolochus nudiusculus has 2<br />
small patches <strong>of</strong> minute hairs on the last abdominal<br />
segment; H. divaricatus has 2 large patches <strong>of</strong> stout<br />
spinules; H. asperatus has 2 large patches <strong>of</strong> hairs on<br />
the last abdominal segment as well as a patch <strong>of</strong> hairs<br />
on each caudal ramus, un<strong>like</strong> the caudal rami <strong>of</strong> H.<br />
nudiusculus. In addition the third segment endopods<br />
<strong>of</strong> legs 2 <strong>and</strong> 3 have small spinules near the bases <strong>of</strong><br />
the outer spines; this ornamentation is lacking in H.<br />
asperatus <strong>and</strong> H. divaricatus. Females <strong>of</strong> this species<br />
can be distinguished from all other species <strong>of</strong><br />
Holobomolochus by the nature <strong>of</strong> the exopod spines<br />
<strong>of</strong> leg 3 (see "Discussion").<br />
Holobomolochus nudiusculus seems to be restricted<br />
to the eastern Pacific but common on its 2 hosts<br />
Scomberomorus concolor <strong>and</strong> S. sierra from California<br />
to Peru.<br />
Holobomolochus asperatus, new species<br />
FIGURES Ic-g, 8, 96<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172242) <strong>and</strong> paratypes 2$ (USNM 172243) from<br />
the nasal sinus <strong>of</strong> Scomberomorus cavalla (MCZ<br />
17182) from Cuba. In addition, 9 collections containing<br />
10 9 are from the nasal sinus <strong>of</strong> S. cavalla from<br />
Georgia, Florida, Texas, Cuba, Trinidad, <strong>and</strong> Brazil.<br />
FEMALE.—Body form as in Figure 7c. Total length<br />
1.79 mm, greatest width 0.75 mm; length <strong>of</strong> cephalon<br />
0.57 mm. Genital segment (Figure 7d) wider than<br />
long (212 X 265 /un). Abdomen 3-segmented, segments<br />
measure (1 X w) 177 X 206 ^n, 129 X 177<br />
fim, <strong>and</strong> 112 X 159 /*m respectively; ventral surface <strong>of</strong><br />
last abdominal segment (see Figure 7e) with 2 prominent<br />
patches <strong>of</strong> hair<strong>like</strong> spinules. Caudal rami (Figure<br />
7e) longer than wide (82 X 53 /un), each ramus with<br />
six setae <strong>and</strong> a patch <strong>of</strong> hair<strong>like</strong> spinules on its ventral<br />
surface; longest seta 768 /*m.<br />
First antenna (Figure 7/) 7-segmented with an<br />
aesthete on segments 6 <strong>and</strong> 7. Second antenna, m<strong>and</strong>ible,<br />
paragnath, first maxilla, second maxilla, <strong>and</strong><br />
maxilliped similar to corresponding appendages in H.<br />
divaricatus.<br />
Leg 1 similar to that <strong>of</strong> H. divaricatus except endopod<br />
<strong>and</strong> basipod lack hairs found in H. divaricatus.<br />
Leg 2 (Figure 86) similar to that <strong>of</strong> H. divaricatus<br />
except exopod second segment lacks spinules at base<br />
<strong>of</strong> outer spine; endopod first <strong>and</strong> second segments each<br />
have a minute patch <strong>of</strong> small hairs on outer distal<br />
corner, outer spines on third segment are small. Leg 3<br />
(Figure 8
8 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
on the rami <strong>of</strong> H. divaricatus or H. nudiusculus) <strong>and</strong><br />
the lack <strong>of</strong> prominent patches <strong>of</strong> spinules on leg 4<br />
(present in H. divaricatus <strong>and</strong> H. nudiusculus).<br />
Holobomolochus asperatus can be distinguished from<br />
all other members <strong>of</strong> the genus by the nature <strong>of</strong> the<br />
leg 3 exopod spines (see Discussion).<br />
This species has been collected only from Scomberomorus<br />
cava.Ua from Georgia to northern Brazil.<br />
Although its range overlaps that <strong>of</strong> H. divaricatus, the<br />
2 parasites have never been collected from a common<br />
host species.<br />
Discussion<br />
The 3 species <strong>of</strong> Holobomolochus described here all<br />
have highly developed spines on the exopod <strong>of</strong> leg 3<br />
<strong>and</strong> the exopod segments themselves are heavily<br />
sclerotized. This character separates these 3 species<br />
from all previously described Holobomolochus.<br />
Although we do not feel that this difference alone<br />
warrants assigning these new species to a new genus,<br />
we feel that an improved underst<strong>and</strong>ing <strong>of</strong> the genus<br />
might result in a better basis for doing so. No other<br />
species <strong>of</strong> Holobomolochus has been collected from<br />
the nasal sinuses <strong>of</strong> the hosts. This unusual habitat<br />
may account for the unique nature <strong>of</strong> these 3 species.<br />
Vnicolax, new genus<br />
DIAGNOSIS.—Bomolochidae. Body form typical <strong>of</strong><br />
family. Thoracic segments bearing legs 3-5 free in<br />
female, thoracic segments bearing legs 2-5 free in<br />
male. Abdomen 3-segmented in female, 2-segmented<br />
in male. Caudal rami in both sexes with 6 setae, 2<br />
much longer than other 4. First antenna 6- or 7-segmented<br />
in female, fourth seta on basal segment modified<br />
to form heavily sclerotized straight or nearly<br />
straight spine; first antenna in male 6-segmented with<br />
no modified setae. Second antenna <strong>and</strong> oral appendages<br />
typical <strong>of</strong> family. Maxilliped hook in female<br />
without accessory process; maxilliped basal segment<br />
in male with numerous small spinules. Legs 1-4<br />
biramous in both sexes; rami <strong>of</strong> legs 1-3 <strong>and</strong> leg 4<br />
exopod 3-segmented, leg 4 endopod 2- or 3-segmented.<br />
Female leg 2 endopod second segment with 2 inner<br />
setae, leg 3 endopod second segment with 1 inner seta.<br />
Rami <strong>of</strong> leg 1 in both sexes broad <strong>and</strong> flattened.<br />
TYPE SPECIES.—Unicolax collateralis new genus,<br />
new species.<br />
ETYMOLOGY.—The Latin, uni-colax (with "colax"),<br />
the suffix "colax" is common in other genera <strong>of</strong> the<br />
family <strong>and</strong> the name alludes to the new genus "with"<br />
others <strong>of</strong> the family.<br />
DISCUSSION.—Unicolax can be separated from all<br />
the other bomolochid genera except Bomolochus by<br />
the modified fourth seta on the basal segment <strong>of</strong> the<br />
first antenna. Holobomolochus, Acanthocolax, Pseudoeucanthus,<br />
Orbitacolax, Pseudorbitacolax, Pumiliopes,<br />
<strong>and</strong> Pumiliopsis have no modified setae or cuticular<br />
process on the first antenna; Boylea has the fifth seta<br />
modified; in Nothobomolochus the third, fourth, <strong>and</strong><br />
fifth setae are modified; in Dicrobomolochus the second<br />
<strong>and</strong> third setae are modified; Ceratacolax <strong>and</strong><br />
Tegobomolochus have a cuticular process in addition<br />
to the usual 15 plumose setae on the first antenna.<br />
Bomolochus is characterized by having the fourth<br />
seta <strong>of</strong> the first antenna modified, but in Bomolochus<br />
this seta is sharply curved <strong>and</strong> lightly sclerotized,<br />
whereas in Unicolax it is straight or nearly so, <strong>and</strong><br />
heavily sclerotized. Unicolax can further be separated<br />
from Bomolochus as the rami <strong>of</strong> the first leg <strong>of</strong> Unicolax<br />
males are flattened <strong>and</strong> broad as in the females;<br />
the first leg <strong>of</strong> Bomolochus males does not resemble<br />
that <strong>of</strong> Bomolochus females.<br />
Unicolax has, so far, only been collected from the<br />
nasal sinuses <strong>of</strong> its hosts.<br />
Vnicolax collateralis, new species<br />
FIGURES 9-13, 97, 114-116*<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172256), allotype $ (USNM 172257) paratypes 12 9<br />
23 d (USNM 172258) from the nasal sinus <strong>of</strong><br />
Euthynnus alletteratus (USNM 203838) from St.<br />
George Bay, Lebanon. The following collections from<br />
Auxis species: 2 9 from Woods Hole, Mass.; 2 S<br />
from St. George Bay, Lebanon; 2 9 3$ from<br />
Ghardaqa, Egypt; 2 collections containing 7 9 3$<br />
from Hong Kong; 2 collections containing 2 9 1 $<br />
from Japan; 7 collections containing 12 9 4$ from<br />
the Philippines; 2 9 from Chusan, China; 1 9 from<br />
Hawaii. One collection containing 5 9 from Cybiosarda<br />
elegans from Brisbane, Australia. The following<br />
collections from Euthynnus affinis: 2 9 2 3 from Elat,<br />
Israel; 2 9 from Mozambique; 2 9 from Madagascar;<br />
1 S from the Seychelles; 4 9 from the Arabian Sea<br />
24°N, 67°E; 2 9 from Java; 16 collections containing
NUMBER 311<br />
29 9 9 $ from the Gulf <strong>of</strong> Thail<strong>and</strong>; 2 9 from Formosa;<br />
2 2 from Hong Kong; 4 collections containing<br />
8 9 1 $ from the Philippines; 1 2 from Palau; 1 9<br />
from Okinawa; 1 $ from Tokyo; 4 2 7 $ from Brisbane,<br />
Australia. The following collections from<br />
Euthynnus alletteratus: 1 9 from the Caribbean<br />
(9°11'N, 77°50'W); 2 9 from Brazil; 4 collections<br />
containing 29 9 16 $ from St. George Bay, Lebanon.<br />
The following collections from Euthynnus lineatus: 1<br />
9 from Galapagos; 1 9 from Lower California; 1 9<br />
from Mexico (Pacific); 2 9 from Costa Rica (Pacific).<br />
One collection containing 1 9 from Orcynopsis unicolor<br />
from St. George Bay, Lebanon. Two collections<br />
containing 5 9 3
10<br />
with inner seta <strong>and</strong> outer spine, third segment with 5<br />
inner to terminal setae <strong>and</strong> 3 terminal to outer spines,<br />
exopod spines similar to corresponding spines <strong>of</strong> leg 2,<br />
except leg 3 lacks haired spine present on third segment<br />
<strong>of</strong> leg 2, all setae plumose; endopod first segment<br />
with inner seta <strong>and</strong> row <strong>of</strong> short hairs along<br />
distal edge, second segment similar to first, third segment<br />
with 2 inner to terminal setae <strong>and</strong> 2 terminal to<br />
outer spines, each with serrate edges <strong>and</strong> terminal<br />
flagellum, all setae plumose, outer edges <strong>of</strong> endopod<br />
segments haired. Leg 4 (Figure life) coxopod with<br />
central patch <strong>of</strong> small spinules <strong>and</strong> row <strong>of</strong> short hairs<br />
along mid-lower edge; basipod lacking ornamentation;<br />
exopod similar to leg 3 except first segment lacks dorsolateral<br />
spinules; endopod first segment with inner seta<br />
<strong>and</strong> row <strong>of</strong> fine hairs along distal edge, seta shorter<br />
than corresponding seta <strong>of</strong> leg 2, constricted slightly<br />
at midpoint, plumose distally finely serrate proximally,<br />
hairs on distal edge <strong>of</strong> segment slightly longer than<br />
corresponding hairs <strong>of</strong> leg 2, second segment similar<br />
to first, third segment with row <strong>of</strong> fine hairs distally<br />
<strong>and</strong> 2 spines flanking terminal seta, spines broadly<br />
serrate <strong>and</strong> with terminal flagellum, seta finely serrate<br />
on distal half, outer edges <strong>of</strong> endopod segments haired.<br />
Leg 5 (Figure lie) basal segment with outer dorsal<br />
seta <strong>and</strong> dense patch <strong>of</strong> short spinules on outer distal<br />
corner; free segment with 3 dense patches <strong>of</strong> short<br />
spinules, one spine on mid-outer margin <strong>and</strong> 2 spines<br />
flanking one terminal naked seta, spines with serrate<br />
edges <strong>and</strong> terminal flagellum. Leg 6 (see Figure 9b)<br />
represented by 2 long <strong>and</strong> one shorter seta on genital<br />
segment.<br />
MALE.—Body form as in Figure lid. Total length<br />
1.09 mm, greatest width 0.44 mm; length <strong>of</strong> cephalon<br />
0.20 mm. Genital segment (Figure 11*) longer than<br />
wide (236X218 fan). Abdomen (see Figure lie)<br />
2-segmented, segments measuring 94 X 112 /*m <strong>and</strong><br />
70 X 88 /*m respectively. Last abdominal segment<br />
ornamented ventrally with anterior row <strong>of</strong> fine spinules<br />
<strong>and</strong> 2 large patches <strong>of</strong> fine hairs (see Figure 12a).<br />
Caudal rami (Figure 12a) longer than wide (53 X<br />
35 fan) ; each ramus with ventral patch <strong>of</strong> fine hairs<br />
<strong>and</strong> 6 setae; longest seta 295 /un.<br />
First antenna (Figure 12b) 6-segmented. First segment<br />
with 5 plumose setae <strong>and</strong> no indication <strong>of</strong><br />
modified spine present on female; fifth <strong>and</strong> sixth segments<br />
each with one aesthete. Second antenna, m<strong>and</strong>ible,<br />
paragnath, first <strong>and</strong> second maxillae similar to<br />
female. Maxilliped (Figure 12c) with one seta <strong>and</strong><br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
large patch <strong>of</strong> small, rounded spinules on second segment;<br />
last segment with 2 setae near base <strong>and</strong> row<br />
<strong>of</strong> teeth along inner edge.<br />
Legs 1-4 biramous. Leg 1 (Figure 12*/) coxopod<br />
with inner seta <strong>and</strong> spinules as indicated in Figure<br />
I2d; basipod with outer seta, blunt process between<br />
insertion <strong>of</strong> rami, <strong>and</strong> inner process sclerotized at<br />
base with terminal, fringed membrane, spinules near<br />
base <strong>of</strong> this process; exopod 3-segmented, first segment<br />
with outer spine, second segment with outer spine <strong>and</strong><br />
inner seta, third segment with 2 outer spines <strong>and</strong> 5<br />
setae; endopod first segment with inner seta, distal<br />
outer edge <strong>of</strong> segment with row <strong>of</strong> hairs, second segment<br />
similar to first, third segment with 5 setae<br />
terminally <strong>and</strong> one outer spine, minute spinules near<br />
bases <strong>of</strong> setae; all setae heavily plumose. Leg 2 (Figure<br />
12tf) coxopod with short row <strong>of</strong> spinules on outer<br />
distal corner <strong>and</strong> row <strong>of</strong> hairs on mid-distal edge;<br />
basipod with naked seta dorsally near outer edge;<br />
exopod first segment with outer distal serrate spine<br />
with terminal flagellum, row <strong>of</strong> fine spinules near<br />
base <strong>of</strong> spine, dorso-lateral surface <strong>of</strong> segment with<br />
several rows <strong>of</strong> short, rounded spinules, second segment<br />
with inner seta <strong>and</strong> outer spine similar to that<br />
on first segment, third segment with 5 inner to terminal<br />
setae <strong>and</strong> 3 terminal to outer spines, proximal<br />
2 spines similar to those on first <strong>and</strong> second segments,<br />
distal spine elongate with broad outer serrations <strong>and</strong><br />
short inner hairs; endopod first segment with inner<br />
seta <strong>and</strong> short row <strong>of</strong> hairs along distal edge, second<br />
segment similar, third segment with 3 inner to terminal<br />
setae <strong>and</strong> 2 outer spines, each finely haired on<br />
edges <strong>and</strong> with terminal flagellum; outer edge <strong>of</strong><br />
endopod segments heavily haired. Leg 3 (Figure 13a)<br />
similar to leg 2, with following exceptions; exopod<br />
second segment lacks outer spine <strong>and</strong> fine spinules;<br />
endopod third segment with only 2 setae, inner spine<br />
about twice as long as outer, ornamentation on edges<br />
<strong>of</strong> each spine serrate rather than haired as in leg 2.<br />
Leg 4 (Figure 13ft) coxopod, basipod, <strong>and</strong> exopod<br />
similar to leg 3 except exopod third segment with<br />
only 4 setae; endopod 2-segmented, first segment with<br />
inner seta, second segment elongate with row <strong>of</strong> fine<br />
hairs distally <strong>and</strong> 2 spines flanking terminal seta,<br />
spines finely serrate with terminal flagella, inner spine<br />
about one-third longer than outer, seta finely serrate<br />
along distal half. Leg 5 (Figure 13c) basal segment<br />
with outer dorsal seta <strong>and</strong> dense patch <strong>of</strong> spinules on<br />
outer distal corner; free segment with terminal outer
NUMBER 3 1 1 11<br />
seta extending almost to end <strong>of</strong> genital segment, <strong>and</strong><br />
inner spine broadly serrate on edges <strong>and</strong> with terminal<br />
flagellum; segment with dense patch <strong>of</strong> spinules on<br />
distal half.<br />
ETYMOLOGY.—The Latin collateredis ("st<strong>and</strong>ing<br />
side by side") alludes to its occurrence in collections<br />
with U. mycterobius.<br />
REMARKS.—Females <strong>of</strong> this species can be distinguished<br />
from U. mycterobius, U. ciliatus, <strong>and</strong><br />
U. reductus principally by the nature <strong>of</strong> the spines<br />
on the exopod third segment <strong>of</strong> leg 2 as the proximal<br />
spine <strong>of</strong> U. collateralis is finely haired on both edges<br />
<strong>and</strong> the next two spines have broad serrations on both<br />
side. This is un<strong>like</strong> the ornamentation <strong>of</strong> corresponding<br />
spines on any <strong>of</strong> the other above species. Unicolax<br />
collateralis can be distinguished from U. anonymous,<br />
which it most closely resembles, by having 3 spines,<br />
5 setae on the exopod third segment <strong>of</strong> leg 4; U.<br />
anonymous has 3 spines, 4 setae on the corresponding<br />
segment. The ventral surface <strong>of</strong> the endopod segments<br />
<strong>of</strong> legs 2-4 are densely haired in U. anonymous,<br />
whereas U. collateralis has only a single row <strong>of</strong> hairs<br />
along the distal edge <strong>of</strong> some <strong>of</strong> its endopod segments.<br />
Males <strong>of</strong> this species can be distinguished from those<br />
<strong>of</strong> U. anonymous by the ornamentation <strong>of</strong> leg 5. Unicolax<br />
collateralis has a patch <strong>of</strong> stout spinules that<br />
extends from about the middle <strong>of</strong> the free segment<br />
distally <strong>and</strong> around the entire distal edge; in U.<br />
anonymous the spinules are distinctly elongate <strong>and</strong><br />
the patch extends distally from above the middle <strong>of</strong><br />
the segment <strong>and</strong> does not continue around to the<br />
outer distal edge. Males can be distinguished from<br />
U. mycterobius, U. ciliatus, <strong>and</strong> U. reductus by the<br />
ornamentation <strong>of</strong> the ventral surface <strong>of</strong> the last abdominal<br />
segment. In U. collateralis this segment has<br />
a single, even row <strong>of</strong> spinules near the anterior<br />
border, <strong>and</strong> 2 large patches <strong>of</strong> hairs. Unicolax mycterobius<br />
has similar ornamentation, but the anterior<br />
row <strong>of</strong> spinules is irregular <strong>and</strong> the spinules are<br />
minute.<br />
This copepod is circumglobal <strong>and</strong> occurs in the<br />
nasal sinuses <strong>of</strong> a variety <strong>of</strong> scombrid hosts (species<br />
<strong>of</strong> Auxis, Cybiosarda, Euthynnus, Orcynopsis, <strong>and</strong><br />
Sarda). It is <strong>of</strong>ten collected with U. mycterobius,<br />
which parasitizes some <strong>of</strong> the same hosts (species <strong>of</strong><br />
Auxis <strong>and</strong> Euthynnus).<br />
Unicolax anonymous (Vervoort, 1965), new<br />
combination<br />
FIGURES 14-16, 98, 116fr—/, 117<br />
Parabomolochus anonymous Vervoort, 1965:3.<br />
MATERIAL EXAMINED.—Two collections containing<br />
319 2 S from the nasal rosettes <strong>of</strong> Euthynnus alletteratus<br />
from Ghana <strong>and</strong> the Gulf <strong>of</strong> Mexico.<br />
FEMALE.—Body form as in Figure 14a. Total length<br />
<strong>of</strong> cephalon 0.37 mm. Genital segment wider than<br />
long (177 X 247 /*m). Abdomen 3-segmented, segments<br />
measure 82 X 153 /*m, 53 X 141 /*m, 70 X<br />
123 /urn length X width respectively. First 2 segments<br />
without ornamentation, last segment with 2 patches<br />
<strong>of</strong> fine hairs ventrally. Gaudal rami each with patch <strong>of</strong><br />
fine hairs <strong>and</strong> 6 setae; longest 171 ^m.<br />
First antenna (Figure 146) 7-segmented. Fourth<br />
seta on first segment modified to form heavily sclerotized<br />
spine; one aesthete on each <strong>of</strong> last 2 segments.<br />
Second antenna (Figure 14c) 3-segmented, last segment<br />
with several rows <strong>of</strong> hook<strong>like</strong> spinules, 4 setae,<br />
<strong>and</strong> 4 hook<strong>like</strong> terminal spines. M<strong>and</strong>ible, paragnath,<br />
first maxilla, second maxilla as in Figure 14a\ Paragnath<br />
with outer row <strong>of</strong> teeth<strong>like</strong> spinules <strong>and</strong> long<br />
hairs; first maxilla with 3 long plumose setae <strong>and</strong><br />
one short, naked seta. Maxilliped (Figure 14e) with<br />
one plumose seta on basal segment, 3 plumose setae<br />
on last segment; hook slightly curved, without accessory<br />
process.<br />
Legs 1-4 biramous, each ramus 3-segmented except<br />
leg 1 exopod. Leg 1 (Figure 15a) coxopod with<br />
broad inner seta; basipod with outer seta, one small<br />
blunt spinule near lower inner edge <strong>and</strong> two large<br />
patches <strong>of</strong> hairs; exopod first segment with outer<br />
spine, second segment with 2 short outer spines <strong>and</strong><br />
6 terminal to inner setae; endopod first <strong>and</strong> second<br />
segments each with inner seta <strong>and</strong> patch <strong>of</strong> hairs on<br />
lower to outer edge, third segment with 5 setae, outer<br />
edges <strong>of</strong> endopod segments heavily haired. Leg 2<br />
(Figure 156) coxopod with inner seta, outer distal<br />
corner with short curved spinules; basipod with outer<br />
seta <strong>and</strong> patch <strong>of</strong> small spinules between insertion <strong>of</strong><br />
rami; exopod first segment with long, slender spinules<br />
on outer edge <strong>and</strong> stout broadly serrate spine with<br />
terminal flagellum on outer distal corner, second segment<br />
with inner seta <strong>and</strong> outer spine similar to that<br />
<strong>of</strong> first segment, third segment with 5 inner to terminal<br />
setae <strong>and</strong> 4 terminal to outer spines, proximal<br />
spine with short hairs along both sides <strong>and</strong> terminal
12 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
flagellum, next 2 spines similar to those <strong>of</strong> first <strong>and</strong><br />
second segments, distal spine elongate with broad<br />
outer serrations <strong>and</strong> short inner hairs; endopod first<br />
segment with inner seta <strong>and</strong> large patch <strong>of</strong> short<br />
hairs distally, second segment enlarged, with 2 inner<br />
setae <strong>and</strong> patch <strong>of</strong> short hairs on outer distal corner,<br />
third segment narrower than second with 3 inner to<br />
terminal setae <strong>and</strong> 2 short terminal spines each with<br />
hairs on edges <strong>and</strong> terminal flagellum, outer edges<br />
<strong>of</strong> endopod segments haired. Leg 3 (Figure 16a)<br />
coxopod <strong>and</strong> basipod similar to leg 2; exopod first<br />
segment with outer distal spine, dorso-lateral surface<br />
<strong>of</strong> segment with several uneven rows <strong>of</strong> short spinules<br />
giving bumpy appearance, second segment with inner<br />
seta <strong>and</strong> outer spine, third segment with 5 inner to<br />
terminal setae <strong>and</strong> 3 terminal to outer spines, exopod<br />
spines similar to corresponding spines <strong>of</strong> leg 2, except<br />
leg 3 lacks haired spine present on third segment <strong>of</strong><br />
leg 2; endopod first segment with inner seta <strong>and</strong><br />
patch <strong>of</strong> hairs covering distal half <strong>of</strong> segment, second<br />
segment with inner seta <strong>and</strong> patch <strong>of</strong> hairs on outer<br />
distal corner, third segment with 2 inner to terminal<br />
setae <strong>and</strong> 2 terminal to outer spines, inner spine<br />
longer, each with serrate edges <strong>and</strong> terminal flagellum,<br />
outer edges <strong>of</strong> endopod segments haired. Leg 4<br />
(Figure 166) coxopod with row <strong>of</strong> short hairs on<br />
mid-distal edge; basipod with outer seta; exopod<br />
first segment with spine on outer distal corner, second<br />
segment with inner seta <strong>and</strong> outer spine, third segment<br />
with 4 inner to terminal setae <strong>and</strong> 3 terminal<br />
to outer spines, exopod spines similar to corresponding<br />
spines <strong>of</strong> leg 3; endopod first segment with inner<br />
seta, proximal half plumose, distal portion edged with<br />
short bristles, segment with large patch <strong>of</strong> short hairs<br />
distally, second segment with inner seta similar to<br />
that <strong>of</strong> first segment, <strong>and</strong> patch <strong>of</strong> short hairs on outer<br />
distal corner, third segment with 2 spines flanking<br />
terminal seta, spines broadly serrate distally, seta with<br />
short bristles on lower half, distal edge <strong>of</strong> segment<br />
with short spinules, outer edges <strong>of</strong> endopod segments<br />
haired. Leg 5 (Figure 16c) basal segment with outer<br />
seta <strong>and</strong> dense patch <strong>of</strong> short spinules on outer distal<br />
corner; free segment with 3 dense patches <strong>of</strong> short<br />
spinules, one spine on mid-outer margin, <strong>and</strong> 2 spines<br />
flanking one naked seta distally, spines each with fine<br />
serrations along distal half <strong>and</strong> terminal flagellum.<br />
Leg 6 (see Figure 14a) represented by 3 setae on<br />
genital segment.<br />
MALE.—Body form as in Figure 16d. Total length<br />
0.81 mm, greatest width 0.36 mm; length <strong>of</strong> cephalon<br />
0.20 mm. Genital segment as long as wide (177 X<br />
177 /an). Abdomen 2-segmented, segments measuring<br />
(length X width) 35 X 94 /un <strong>and</strong> 59 X 70 /un.<br />
Caudal rami slightly longer than wide (35 X 29 /*m) ;<br />
longest seta 177 pin.<br />
All appendages <strong>and</strong> ornamentation similar to (although<br />
proportionately smaller than) U. collaterals<br />
except leg 5.<br />
Leg 5 (Figure 16«) similar to U. collaterals except<br />
patch <strong>of</strong> spinules on free segment covers lower twothirds<br />
<strong>of</strong> inner half <strong>of</strong> segment <strong>and</strong> does not extend<br />
around the entire distal edge; also, spinules on both<br />
basal <strong>and</strong> free segments ar*» longer <strong>and</strong> more slender<br />
than those <strong>of</strong> U. collateralis.<br />
REMARKS.—Unicolax anonymous was described by<br />
Vervoort (1965) as Parabomolochus anonymous from<br />
the nasal sinus <strong>of</strong> Euthynnus alletteratus from the<br />
Gulf <strong>of</strong> Guinea.<br />
We believe the copepods above to be the same<br />
species as Vervoort's even though our descriptions<br />
differ on some points. Vervoort (1965:6) reported<br />
"no spinules on the abdominal somites" <strong>of</strong> the female.<br />
We, however, found 2 patches <strong>of</strong> hairs on the ventral<br />
surface <strong>of</strong> the last abdominal segment as well as a<br />
ventral patch <strong>of</strong> hairs on each caudal ramus. Vervoort<br />
(1965:11) further reported that "the external<br />
margin <strong>of</strong> the first exopod segment [<strong>of</strong> legs 2-4] is<br />
strongly haired." We found this true only <strong>of</strong> leg 2;<br />
on legs 3 <strong>and</strong> 4 the first exopod segment was ornamented<br />
by several irregular rows <strong>of</strong> bump<strong>like</strong> spinules.<br />
In spite <strong>of</strong> these differences we feel we are dealing<br />
with the same species for the following reasons: the<br />
copepods reported here are from the same host species<br />
<strong>and</strong> the same locality (<strong>and</strong> the Gulf <strong>of</strong> Mexico as<br />
well) as those described by Vervoort; Vervoort reported<br />
collecting Ceratocolax euthynni from the same<br />
individual hosts as U. anonymous, we also found<br />
C. euthynni in both our collections with U. anonymous;<br />
apart from the differences mentioned above,<br />
our descriptions are in agreement.<br />
Females <strong>of</strong> U. anonymous can be distinguished<br />
from U. mycterobius, U. ciliatus, <strong>and</strong> U. reductus<br />
by the nature <strong>of</strong> the spines on the exopod third segment<br />
<strong>of</strong> leg 2. The proximal spine in U. anonymous<br />
is finely haired on both sides while the remaining<br />
spines are broadly serrate; this ornamentation is un<strong>like</strong><br />
that <strong>of</strong> the corresponding spines <strong>of</strong> any other <strong>of</strong><br />
the above species. Unicolax anonymous can be dis-
NUMBER 3 1 1 13<br />
tinguished from U. collateralis, which it most closely<br />
resembles, by the ornamentation <strong>of</strong> the exopod third<br />
segment <strong>of</strong> leg 4; U. anonymous has 3 spines, 4 setae;<br />
U. collateralis has 3 spines, 5 setae. Further, the<br />
endopod segments <strong>of</strong> legs 2-4 in U. anonymous each<br />
have a dense patch <strong>of</strong> hairs; U. collateralis has only<br />
a single row <strong>of</strong> hairs near the distal border <strong>of</strong> some<br />
<strong>of</strong> its endopod segments.<br />
Unicolax anonymous males have, on the free segment<br />
<strong>of</strong> leg 5, a patch <strong>of</strong> elongate spinules that extends<br />
from above the middle <strong>of</strong> the segment to the<br />
inner distal border; the spinules do not continue<br />
around the entire distal border <strong>of</strong> the segment. This<br />
ornamentation is un<strong>like</strong> that <strong>of</strong> other species <strong>of</strong> Unicolax<br />
males.<br />
This copepod has, so far, only been reported from<br />
the nasal sinuses <strong>of</strong> Euthynnus alletteratus from the<br />
Gulf <strong>of</strong> Guinea <strong>and</strong> the Gulf <strong>of</strong> Mexico. It is a relatively<br />
small copepod <strong>and</strong> may, as Vervoort noted,<br />
frequently be overlooked.<br />
Unicolax mycterobius (Vervoort, 1965),<br />
new combination<br />
FIGURES 17-19, 99, 118, 119a-
14<br />
along distal half, spines with bristled margins <strong>and</strong><br />
terminal flagellum, outer edges <strong>of</strong> endopod segments<br />
haired. Leg 5 (Figure 186) basal segment with small<br />
outer patch <strong>of</strong> short hairs <strong>and</strong> dorsal seta; free segment<br />
with dense patches <strong>of</strong> hairs, one naked spine<br />
with terminal flagellum on mid-outer margin, one<br />
naked terminal seta flanked by 2 spines, outer spine<br />
naked with terminal flagellum, inner spine with short<br />
bristles along margins <strong>and</strong> terminal flagellum. Leg 6<br />
(see Figure 17a) represented by 3 setae on genital<br />
segment.<br />
MALE.—Body form as in Figure 18c. Total length<br />
1.36 mm, greatest width 0.52 mm; length <strong>of</strong> cephalon<br />
0.35 mm. Genital segment longer than wide (336 X<br />
289 /*m). Abdomen 2-segmented, segments measuring<br />
(length X width) 100 X 129 /an <strong>and</strong> 70 X 106 (an<br />
respectively; second segment (see Figure \8d) ornamented<br />
ventrally with anterior, irregular row <strong>of</strong> minute<br />
hairs <strong>and</strong> distally with 2 patches <strong>of</strong> minute hairs.<br />
Caudal rami (Figure I8d) longer than wide (70 X<br />
41 /an); each ramus with ventral patch <strong>of</strong> hairs <strong>and</strong><br />
6 setae; longest seta 383 /xm.<br />
Cephalic appendages similar to those <strong>of</strong> U. collateralis<br />
male.<br />
Legs 1-4 biramous. Leg 1 (Figure \8e) coxopod<br />
with broad inner seta <strong>and</strong> 2 short rows <strong>of</strong> fine spinules,<br />
one on outer distal corner, one on mid-distal<br />
edge; basipod with outer seta, blunt process near<br />
insertion <strong>of</strong> rami, <strong>and</strong> inner spine sclerotized at base<br />
<strong>and</strong> with fringed membrane distally, a large, prominent<br />
patch <strong>of</strong> rounded spinules surrounding base <strong>of</strong><br />
spine <strong>and</strong> extending to mid portion <strong>of</strong> segment (see<br />
Figure 18/); exopod first segment with stout spine on<br />
outer distal corner, row <strong>of</strong> fine spinules surrounding<br />
base <strong>of</strong> spine, second segment incompletely divided<br />
with 6 inner to terminal setae, one outer setiform<br />
spine <strong>and</strong> 2 stout outer spines (one dorsal) as indicated<br />
in Figure 18/; endopod 3-segmented, similar to<br />
U. collateralis except first 2 segments each with large<br />
patch <strong>of</strong> hairs on distal half, <strong>and</strong> third segment with<br />
spinules more prominent than those <strong>of</strong> U. collateralis<br />
near bases <strong>of</strong> setae. Leg 2 (Figure 19a) coxopod with<br />
inner plumose seta <strong>and</strong> row <strong>of</strong> hairs on mid-distal<br />
margin; basipod with naked seta on outer dorsal<br />
corner; exopod similar to that <strong>of</strong> U. collateralis except<br />
first segment with large patch <strong>of</strong> fine hairs<br />
around outer ventro-lateral portion <strong>of</strong> segment, also,<br />
spinules at base <strong>of</strong> proximal 4 spines <strong>of</strong> ramus stout,<br />
some almost half as long as accompanying spines;<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
endopod similar to that <strong>of</strong> U. collateralis except first<br />
<strong>and</strong> second segments each with large patch <strong>of</strong> fine hairs<br />
along outer <strong>and</strong> distal borders, third segment with<br />
comparatively small patch <strong>of</strong> fine hairs along outer<br />
edge, <strong>and</strong> several short, irregular rows <strong>of</strong> minute spinules<br />
as well as 2 or 3 small patches <strong>of</strong> bumps along<br />
distal margin at bases <strong>of</strong> terminal 2 spines <strong>and</strong> 3 setae.<br />
Leg 3 (Figure 19b) similar to leg 2 with following<br />
exceptions: exopod first segment with 2 patches <strong>of</strong><br />
ventro-lateral spinules, proximal patch hair<strong>like</strong>, distal<br />
patch small, fine spinules; second segment lacks outer<br />
spine <strong>and</strong> accompanying basal spinules; endopod third<br />
segment with only 2 inner to terminal setae, outer<br />
spines slightly larger than those <strong>of</strong> leg 2, with inner<br />
spine about one-third longer than outer. Leg 4 (Figure<br />
19c) coxopod, basipod, exopod similar to leg 3 except<br />
ventro-lateral spinules <strong>of</strong> first segment all very fine<br />
<strong>and</strong> third segment with only 4 inner to terminal setae;<br />
endopod completely or incompletely divided into 3<br />
segments (see "Remarks"), first <strong>and</strong> second segments<br />
similar to those <strong>of</strong> legs 2 <strong>and</strong> 3 except second segment<br />
lacks inner seta, third segment with 2 or 3 short,<br />
irregular rows <strong>of</strong> fine spinules distally <strong>and</strong> 2 spines<br />
flanking terminal seta, spines <strong>of</strong> about equal length,<br />
each finely serrate <strong>and</strong> with terminal flagellum, seta<br />
finely spinulose along distal two-thirds. Leg 5 similar<br />
to that <strong>of</strong> U. collateralis, outer seta extending to about<br />
half the length <strong>of</strong> genital segment.<br />
REMARKS.—Vervoort (1965) first described this<br />
species as Parabomolochus mycterobius. His description<br />
was based on a single collection <strong>of</strong> 6 females <strong>and</strong><br />
2 males from the nasal sinus <strong>of</strong> Auxis thazard from<br />
the Gulf <strong>of</strong> Guinea. Our collections have enabled us<br />
to add details to Vervoort's original description.<br />
Unicolax mycterobius females are the only known<br />
members <strong>of</strong> the genus in which all the exopod spines<br />
<strong>of</strong> legs 2-4 are edged with fine hairs; the distalmost<br />
spine has fine hairs on the outer edge only, all other<br />
exopod spines have hairs on both edges. Females <strong>of</strong><br />
other species <strong>of</strong> the genus have stout serrations on<br />
some or all <strong>of</strong> the exopod spines <strong>of</strong> legs 2-A. The free<br />
segment <strong>of</strong> leg 5 <strong>of</strong> U. mycterobius females has 3<br />
patches <strong>of</strong> fine hairs; other species have patches <strong>of</strong><br />
distinctly stout spinules on the corresponding segment.<br />
Males <strong>of</strong> the species can be separated principally<br />
by the nature <strong>of</strong> legs 1 <strong>and</strong> 4. Leg 1 basipod has a<br />
very large, prominent patch <strong>of</strong> rounded spinules near<br />
the inner distal corner. Although males <strong>of</strong> other species<br />
have ornamentation at the corresponding site, in
NUMBER 311 15<br />
no other species is the patch as large or the spinules as<br />
prominent as in U. mycterobius.<br />
Leg 4 endopod is 2 or 3 segmented, the variation<br />
seems to be geographical. In the 7 collections containing<br />
U. mycterobius males, 3 (containing 6 males)<br />
were from the Pacific (Tokyo <strong>and</strong> New South Wales),<br />
4 (containing 8 males) were from Massachusetts <strong>and</strong><br />
Lebanon. Males from the Pacific have 3-segmented leg<br />
4 endopods with clear articulation between the second<br />
<strong>and</strong> third segments. Males from Massachusetts <strong>and</strong><br />
Lebanon have 2-segmented endopods, yet retain evidence<br />
<strong>of</strong> the third segment in that they have a patch<br />
<strong>of</strong> fine hairs mid-way along the outer edge <strong>of</strong> the last<br />
segment where the articulation would be. No other<br />
differences were found between males <strong>of</strong> the 2 populations.<br />
<strong>Copepods</strong> from both populations were found<br />
on species <strong>of</strong> Auxis <strong>and</strong> Euthynnus; females collected<br />
with males from both populations did not appear to be<br />
different from each other.<br />
Males <strong>of</strong> this species also have more prominent<br />
spinules at the base <strong>of</strong> exopod spines <strong>of</strong> legs 2—4 <strong>and</strong><br />
denser patches <strong>of</strong> hairs on endopod segments <strong>of</strong> legs<br />
2-4 than males <strong>of</strong> other species.<br />
Unicolax mycterobius occurs from the northwestern<br />
Atlantic to the Western Pacific <strong>and</strong> is found in the<br />
nasal sinuses <strong>of</strong> species <strong>of</strong> Auxis <strong>and</strong> Euthynnus.<br />
Unicolax ciliatus, new species<br />
FIGURES 20-22, 98<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172253) allotype $ (USNM 172254) <strong>and</strong> 1 9 paratype<br />
(USNM 172255) from the nasal sinus <strong>of</strong> Scomberomorus<br />
plurilineatus (USNM 273221) E. African<br />
Marine Fisheries, Zanzibar Channel, 6 October 1965.<br />
The following collections from S. commerson: 2 9<br />
from N.W. Coast <strong>of</strong> Madagascar; 2 9, 1 £ from<br />
Travancore, India; 6 9 from Cochin, India; 4 9 from<br />
Batavia, Java; 2 9 1 $ from Phuket, Thail<strong>and</strong>; 1 9<br />
from Hong Kong; 5 collections containing 23 9 1 i<br />
from the Philippines. The following collections from<br />
S. guttatus: 1 9 from Calicut, India; 1 9 from<br />
Padang, Sumatra; 2 9 from Batavia, Java; 1 9 from<br />
Singapore; 1 9 from Phuket, Thail<strong>and</strong>; 2 collections<br />
containing 7 9 from Hong Kong; 3 collections containing<br />
13 9 from China. The following collections<br />
from S. niphonius: 1 9 from Korea; 1 9 from China.<br />
The following collection from S. semifasciatus: 5 9<br />
1 $ from New Guinea. The following collections from<br />
S. tritor: 2 collections containing 4 9 from Liberia;<br />
8 9 from Ghana; 2 9 from Lagos, Nigeria.<br />
FEMALE.—Body form as in Figure 20a. Total length<br />
2.30 mm, greatest width 1.01 mm, length <strong>of</strong> cephalon<br />
0.60 mm. Genital segment wider than long (265 X<br />
330 juin). Abdomen 3-segmented, segments measuring<br />
165 X 212 ,un, 118 X 171 tan, 147 X 159 /un respectively.<br />
Caudal rami longer than wide (141 X 59 fun),<br />
longest seta 590 /an. Ventral side <strong>of</strong> last abdominal<br />
segment <strong>and</strong> caudal rami with patches <strong>of</strong> hairs similar<br />
to Unicolax collateralis.<br />
First antenna (Figure 206) 7-segmented; segments<br />
armed similarly to U. collateralis; spine on first segment<br />
about twice as long as adjacent plumose setae.<br />
Second antenna, mouthparts, <strong>and</strong> maxilliped similar<br />
to U. collateralis.<br />
Legs 1-4 biramous, each ramus 3-segmented. Leg 1<br />
coxopod <strong>and</strong> endopod similar to U. collateralis; basipod<br />
similar to U. collateralis except outer plumose<br />
seta more robust (see Figure 20c) ; exopod (Figure<br />
20c) distinctly 3-segmented, first segment with outer<br />
crenulated spine with terminal flagellum, second segment<br />
with short outer spine with terminal flagellum<br />
about twice as long as spine <strong>and</strong> 3 terminal to inner<br />
plumose setae, third segment with outer spine similar<br />
to that on second segment <strong>and</strong> 3 terminal plumose<br />
setae. Leg 2 endopod similar to U. collateralis, coxopod<br />
with patch <strong>of</strong> long slender spinules near outer distal<br />
corner <strong>and</strong> short row <strong>of</strong> minute hairs along midlower<br />
edge; basipod with outer dorsal seta <strong>and</strong> row <strong>of</strong><br />
short spinules along outer distal edges; exopod (Figure<br />
20a") first segment with large patch <strong>of</strong> long, slender<br />
spinules on outer edge, patch <strong>of</strong> hairs on inner edge<br />
<strong>and</strong> outer distal spine with short hairs on edges <strong>and</strong><br />
short, terminal flagellum, second segment with long<br />
inner plumose seta <strong>and</strong> outer spine similar to that on<br />
first segment, third segment with 5 inner to terminal<br />
plumose setae <strong>and</strong> 4 outer to terminal spines, proximal<br />
3 spines similar to spines <strong>of</strong> first <strong>and</strong> second segments,<br />
terminal spine elongate with outer serrations <strong>and</strong> short,<br />
inner hairs. Leg 3 (Figure 21a) coxopod with row <strong>of</strong><br />
short spinules on outer distal corner; basipod with<br />
outer dorsal seta <strong>and</strong> short row <strong>of</strong> short spinules on<br />
outer distal corner; exopod first segment with outer<br />
distal spine with serrate rather than haired edges as<br />
in leg 2, <strong>and</strong> terminal flagellum, inner edge <strong>of</strong> segment<br />
haired, dorsolateral surface <strong>of</strong> segment with several<br />
rows <strong>of</strong> short spinules giving bumpy appearance,
16 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
second segment with inner plumose seta <strong>and</strong> outer<br />
spine similar to that on first segment, third segment<br />
with 5 inner to terminal plumose setae <strong>and</strong> 3 outer to<br />
terminal spines, proximal 2 spines similar to those <strong>of</strong><br />
first <strong>and</strong> second segments, distal spine elongate, similar<br />
to corresponding spine <strong>of</strong> leg 2; endopod first segment<br />
with inner plumose seta <strong>and</strong> short row <strong>of</strong> fine<br />
hairs near outer distal corner, second segment armed<br />
similarly to first but segment slightly more elongate,<br />
third segment with 2 inner to terminal plumose setae<br />
<strong>and</strong> 2 outer to terminal spines, each with serrate edges<br />
<strong>and</strong> terminal flagellae, inner spine about twice as long<br />
as outer spine, outer edges <strong>of</strong> endopod segments haired.<br />
Leg 4 (Figure 2\b) coxopod with short row <strong>of</strong> small<br />
spinules on outer distal corner; basipod with outer<br />
dorsal seta; exopod first segment with spine on outer<br />
distal corner <strong>and</strong> hairs on inner edge, second segment<br />
with inner plumose seta <strong>and</strong> outer spine, third segment<br />
with 5 inner to terminal plumose setae <strong>and</strong> 3 outer to<br />
terminal spines, exopod spines slightly more elongate<br />
than corresponding spines <strong>of</strong> leg 3, but similarly armed;<br />
endopod first segment with short row <strong>of</strong> short hairs<br />
on outer half <strong>of</strong> distal edge <strong>and</strong> inner seta constricted<br />
near mid-point, plumose above constriction, finely<br />
serrate below it, second segment similar to first, third<br />
segment with fine hairs along outer half <strong>of</strong> distal edge<br />
<strong>and</strong> 2 spines with serrate edges <strong>and</strong> terminal flagella<br />
flanking a terminal seta finely serrate on lower half,<br />
outer edges <strong>of</strong> endopod segments haired. Leg 5 (Figure<br />
21c) basal segment with dorsal seta <strong>and</strong> row <strong>of</strong> minute<br />
spinules on outer half <strong>of</strong> distal edge; free segment<br />
with 2 outer patches <strong>of</strong> spinules, one near mid-segment,<br />
one distal, both patches with small, widely-spaced<br />
spinules, large dense patch <strong>of</strong> more elongate spinules<br />
from mid-inner edge to distal edge <strong>of</strong> segment, one<br />
spine on mid-outer margin <strong>and</strong> 2 spines flanking<br />
terminal, naked seta, spines with finely serrate edges<br />
<strong>and</strong> terminal flagellum. Leg 6 represented by 2 long<br />
<strong>and</strong> one shorter seta on genital segment.<br />
MALE.—Body form as in Figure 21 d. Total length<br />
1.23 mm, greatest width 0.46 mm; length <strong>of</strong> cephalon<br />
0.29 mm. Genital segment longer than wide (265 X<br />
177 /an). Abdomen 2-segmented, segments measuring<br />
(length X width) 88 X 88 /*m, <strong>and</strong> 88 X 70 /*m,<br />
ventral surface <strong>of</strong> second segment (see Figure 21«)<br />
ornamented with 4 rows <strong>of</strong> slender, elongate spinules,<br />
2 proximal rows that meet at mid-point <strong>of</strong> segment<br />
<strong>and</strong> 2 separate distal rows. Caudal rami (Figure 21«?)<br />
longer than wide (59 X 29 jan) each ram us with 6<br />
setae <strong>and</strong> ventral patch <strong>of</strong> hairs; longest seta 413 /*m.<br />
First antenna similar to that <strong>of</strong> U. collateralis male<br />
except distal seta on third segment heavily plumose<br />
<strong>and</strong> extends beyond aesthete <strong>of</strong> terminal segment.<br />
Remaining cephalic appendages similar to those <strong>of</strong><br />
U. collateralis male.<br />
Legs 1-4 biramous. Leg 1 similar to that <strong>of</strong> U. collateralis<br />
male except endopod third segment with<br />
outer spine haired on outer edge <strong>and</strong> with terminal<br />
flagellum (see Figure 21/). Legs 2-5 (Figures 22a—d<br />
respectively) similar to those <strong>of</strong> U. collateralis male<br />
with following exceptions: leg 3 endopod third segment<br />
outer 2 spines each with lateral serrations as<br />
broad as those <strong>of</strong> exopod spines; leg 4 endopod first<br />
segment inner seta extends beyond spines <strong>of</strong> second<br />
segment almost as far as terminal seta, spines <strong>of</strong> second<br />
segment <strong>of</strong> about equal length, serrations <strong>of</strong> outer<br />
spine broader than those <strong>of</strong> inner spine; leg 5 basal<br />
segment with single row <strong>of</strong> small spinules on outer<br />
distal edge, free segment with single row <strong>of</strong> distal<br />
spinules near bases <strong>of</strong> terminal spine <strong>and</strong> seta, spinules<br />
on inner lateral margin <strong>of</strong> segment limited to a few<br />
irregular rows.<br />
ETYMOLOGY.—The Latin ciliatus ("hairy") alludes<br />
to the hairs rather than serrations on the spines <strong>of</strong> the<br />
exopod <strong>of</strong> leg 2.<br />
REMARKS.—Females <strong>of</strong> this species can be distinguished<br />
from all others <strong>of</strong> the genus by the nature <strong>of</strong><br />
the spines on the exopod third segment <strong>of</strong> leg 2. The<br />
first 3 spines are finely haired on both sides, the distal,<br />
elongate spine has conspicuous, broad serrations on<br />
the outer edge. Unicolax anonymous, U. collateralis,<br />
<strong>and</strong> U. reductus have broad, lateral serrations on the<br />
last 3 spines <strong>of</strong> the corresponding segment. Unicolax<br />
mycterobius has fine hairs rather than serrations on<br />
the distal elongate spine.<br />
Unicolax ciliatus is the only species in which the<br />
ornamentation <strong>of</strong> the exopod spines <strong>of</strong> leg 2 differs<br />
from that <strong>of</strong> legs 3 <strong>and</strong> 4. The modified spine <strong>of</strong> the<br />
first antenna is comparatively longer <strong>and</strong> more slender<br />
in U. ciliatus than in other species.<br />
Males <strong>of</strong> this species are characterized by having,<br />
on the ventral surface <strong>of</strong> the last abdominal segment,<br />
a row <strong>of</strong> spinules near the insertion <strong>of</strong> each caudal<br />
ramus <strong>and</strong> a proximal row <strong>of</strong> spinules in each right<br />
<strong>and</strong> left half; the 2 proximal rows meet along the<br />
mid line <strong>of</strong> the segment, the 2 distal rows are interrupted<br />
medially (see Figure 21
NUMBER 3 1 1 17<br />
This species is found from the western Pacific to<br />
the Gulf <strong>of</strong> Guinea <strong>and</strong> is, so far, the only species <strong>of</strong><br />
Unicolax found on species <strong>of</strong> Scomberomorus.<br />
Vnicolax reductus, new species<br />
FIGURES 23-26, 99, \\9d-f, 12O-122a,6<br />
MATERIAL EXAMINED. — Holotype 9 (USNM<br />
172259), allotype $ (USNM 172260), paratypes<br />
15 5 (USNM 172261) from Katsuwonus pelamis<br />
(USNM 176974) nasal sinus from New South Wales.<br />
Additional material from the same host: 24 9 2$<br />
from Tahiti <strong>and</strong> 25 9 1 & from Japan. All copepods<br />
collected from the nasal sinuses <strong>of</strong> the hosts.<br />
FEMALE.—Body form as in Figure 23a. Total length<br />
2.94 mm, greatest width 1.50 mm; length <strong>of</strong> cephalon<br />
0.94 mm. Genital segment (Figure 236) wider than<br />
long (289 X 501 /*m). Abdomen (see Figure 236)<br />
3-segmented, segments measuring 206 X 247 /*m,<br />
188 X 230 Aim, 230 X 200 /un respectively; segments<br />
without ornamentation. Caudal rami (Figure 23c)<br />
longer than wide (206 X 88 /an) each ramus bearing<br />
6 setae <strong>and</strong> no other ornamentation, longest seta<br />
401 fim.<br />
First antenna (Figure 23d) 6-segmented. Ornamentation<br />
<strong>of</strong> segments as follows. Segment 1: 3 plumose<br />
setae; 1 seta modified to form a sclerotized spine;<br />
1 plumose seta. Segment 2: 5 antero-dorsal naked<br />
setae; 10 long plumose setae in a diagonal line across<br />
ventral surface <strong>of</strong> segment; 4 short, ventral plumose<br />
setae; 1 ventral naked seta. Segment 3: one anteroventral<br />
naked seta; one postero-ventral sparcely plumose<br />
seta. Segment 4: one ventral naked seta; one<br />
dorsal naked seta. Segment 5: 2 terminal ventral naked<br />
setae; one ventral aesthete. Segment 6: 6 terminal<br />
naked setae; one sub terminal naked seta; one terminal<br />
aesthete. Second antenna (Figure 23*) similar to<br />
U. collaterals <strong>and</strong> ciliatus. Labrum similar to U. collateralis.<br />
Remaining mouthparts as in Figure 23/.<br />
Maxilliped (Figure 24a) basal segment with one plumose<br />
seta; second segment with 3 plumose setae; hook<br />
bent, with elbow<strong>like</strong> shape, <strong>and</strong> without accessory<br />
process.<br />
Legs 1-4 biramous, each ramus 3-segmented except<br />
leg 1 exopod <strong>and</strong> leg 4 endopod. Leg 1 (Figure 246)<br />
coxopod with broad inner seta, patch <strong>of</strong> small hairs<br />
<strong>and</strong> a blunt process near inner distal edge; basipod with<br />
outer patch <strong>of</strong> small hairs; exopod first segment with<br />
outer spine with fine serrations <strong>and</strong> terminal flagellum,<br />
second segment incompletely divided, with one outer<br />
flagellated spine <strong>and</strong> 6 terminal to inner plumose<br />
setae; endopod first segment with inner plumose seta<br />
<strong>and</strong> small hairs on distal <strong>and</strong> outer portion <strong>of</strong> segment,<br />
second segment with inner plumose seta, third segment<br />
with 5 terminal plumose setae. Leg 2 (Figure<br />
24c) coxopod with few, widely spaced hairs along<br />
distal edge; basipod with outer dorsal seta <strong>and</strong> patch<br />
<strong>of</strong> fine spinules on distal edge near insertion <strong>of</strong> endopod;<br />
exopod first segment with patch <strong>of</strong> fine spinules<br />
on lower, outer portion <strong>of</strong> segment, row <strong>of</strong> several,<br />
stout spinules near base <strong>of</strong> spine on outer distal corner,<br />
spine with few, broad serrations <strong>and</strong> fine terminal<br />
flagellum, second segment with short, inner, naked<br />
seta, row <strong>of</strong> stout spinules near base <strong>of</strong> outer spine<br />
similar to that on first segment, third segment with<br />
4 inner to terminal, sparcely plumose setae, <strong>and</strong> 3<br />
outer to terminal spines, proximal 2 spines each with<br />
row <strong>of</strong> stout spinules near base <strong>and</strong> similar to those <strong>of</strong><br />
first <strong>and</strong> second segments, terminal spine elongate<br />
with few, broad outer serrations; endopod first segment<br />
with stout, inner, plumose seta <strong>and</strong> patch <strong>of</strong><br />
fine hairs on lower, outer edge <strong>of</strong> segment, second<br />
segment enlarged, with 2 inner, plumose setae <strong>and</strong><br />
patch <strong>of</strong> fine hairs on outer, distal corner, third segment<br />
with 3 inner to terminal plumose setae <strong>and</strong> 2<br />
small, outer to terminal spines, each with finely serrate<br />
edges, outer edges <strong>of</strong> endopod segments haired.<br />
Leg 3 (Figure 24d) coxopod without ornamentation;<br />
basipod with outer, dorsal seta <strong>and</strong> small patch <strong>of</strong><br />
fine spinules near insertion <strong>of</strong> endopod; exopod similar<br />
to leg 2 except spinules on lower, outer portion <strong>of</strong> first<br />
segment slightly larger <strong>and</strong> more sparcely placed than<br />
corresponding spinules <strong>of</strong> leg 2; endopod first segment<br />
with inner, sparcely plumose seta <strong>and</strong> patch <strong>of</strong> fine<br />
spinules on outer half <strong>of</strong> distal edge, second segment<br />
similar to first, third segment with 2 inner to terminal<br />
sparcely plumose setae, 2 outer to terminal spines each<br />
with broadly serrate edges <strong>and</strong> terminal flagellum<br />
(terminal spine longer than outer spine) <strong>and</strong> small<br />
patch <strong>of</strong> spinules near base <strong>of</strong> spines, outer edges <strong>of</strong><br />
endopod segments with short hairs. Leg 4 (Figure<br />
25a) coxopod <strong>and</strong> basipod similar to leg 3; exopod<br />
similar to leg 3 with following exceptions: first segment<br />
with very few spinules on outer portion <strong>of</strong> segment;<br />
third segment with only 3 rather than 4<br />
sparcely plumose setae; also spines slightly longer than<br />
corresponding spines <strong>of</strong> leg 3; endopod first segment
18<br />
with inner seta finely serrate distally <strong>and</strong> patch <strong>of</strong><br />
spinules along outer distal edge, few spinules on outer<br />
edge, second segment incompletely divided with triangular<br />
patch <strong>of</strong> spinules proximal to division indicating<br />
probable fusion <strong>of</strong> second <strong>and</strong> third segments,<br />
uneven row <strong>of</strong> stout spinules distally near bases <strong>of</strong><br />
terminal seta flanked by 2 spines, seta finely serrate<br />
distally, outer spine similar to those on exopod, inner<br />
spine with fine serrations, outer edge <strong>of</strong> segment with<br />
two patches <strong>of</strong> short hairs. Leg 5 (Figure 25b) basal<br />
segment with naked, dorsal seta, patch <strong>of</strong> spinules on<br />
outer, distal corner; free segment with patch <strong>of</strong> spinules<br />
on inner edge <strong>and</strong> a row <strong>of</strong> stout spinules near<br />
base <strong>of</strong> each <strong>of</strong> the following: one, terminal, naked<br />
seta; 3 spines, one on mid-outer edge, one on each<br />
side <strong>of</strong> terminal seta, all spines stout with broad serrations<br />
distally <strong>and</strong> fine, terminal flagellurn. Leg 6 (see<br />
Figure 23b) represented by 3 short setae, <strong>of</strong> about<br />
equal length, on genital segment.<br />
MALE.—Body form as in Figure 25c. Total length<br />
1.78 mm, greatest width 0.78 mm; length <strong>of</strong> cephalon<br />
0.39 mm. Genital segment (Figure 25d) slightly<br />
wider than long (277 X 300 /mi), abdomen 2-segmented,<br />
segments measuring (length X width) 159<br />
X 177 /an, <strong>and</strong> 194 X 147 /on; second segment with<br />
two ventral rows <strong>of</strong> minute spinules (see Figure 25^).<br />
Caudal rami (Figure 25«) longer than wide (141 X<br />
73 fixn) with no ornamentation other than 6 setae<br />
(longest 371 pin).<br />
First antenna similar to that <strong>of</strong> U. collateralis male.<br />
Remaining cephalic appendages (except rnaxilliped)<br />
similar to those <strong>of</strong> female. Maxilliped (Figure 26a)<br />
second segment inflated with 2 naked setae <strong>and</strong> numerous<br />
irregular rows <strong>of</strong> low, rounded spinules; terminal<br />
segment claw-<strong>like</strong> with 2 naked setae <strong>and</strong> row <strong>of</strong><br />
teeth<strong>like</strong> spinules along inner edge to apex.<br />
Legs 1-4 biramous. Leg 1 (Figure 266) basipod<br />
with stout outer seta, patch <strong>of</strong> hairs near insertion <strong>of</strong><br />
rami, inner spine sclerotized at base with terminal<br />
fringed membrane, patch <strong>of</strong> spinules near base <strong>of</strong><br />
spine extending midway up segment; exopod 3-segmented,<br />
first segment with outer spine with stout<br />
terminal flagellum, second segment with inner seta<br />
<strong>and</strong> outer spine similar to that on first segment, third<br />
segment with 5 setae <strong>and</strong> 2 outer spines, proximal<br />
spine similar to previous 2, distal spine simple, not<br />
heavily sclerotized; endopod 3-segmented, similar to<br />
U. mycterobius male except patches <strong>of</strong> hairs on first<br />
<strong>and</strong> second segments smaller. Leg 2 (Figure 26c)<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
similar to female except exopod setae comparatively<br />
longer; endopod setae longer than <strong>and</strong> not as robust<br />
as in female <strong>and</strong> second segment not as inflated. Legs<br />
3 <strong>and</strong> 4 similar to female. Leg 5 (Figure 26d) basal<br />
segment with dorsal naked seta; free segment ornamented<br />
similarly to female, but segment itself not as<br />
robust.<br />
ETYMOLOGY.—The Latin reductus ("reduced")<br />
alludes to the reduced number <strong>of</strong> setae on exopods<br />
<strong>of</strong> legs 2-4 <strong>and</strong> the reduced number <strong>of</strong> segments <strong>of</strong><br />
the endopod <strong>of</strong> leg 4.<br />
REMARKS.—Females <strong>of</strong> U. reductus can be distinguished<br />
from other Unicolax by the following characters:<br />
the ventral surface <strong>of</strong> the last abdominal segment<br />
has' no ornamentation; the caudal rami have<br />
only six setae each, with no ventral hairs or spinules<br />
(other species have a ventral patch <strong>of</strong> hairs on each<br />
ramus); leg 2 exopod third segment has 3 spines,<br />
4 setae (other species have 4 spines, 5 setae); leg 3<br />
exopod third segment has 4 setae (other species have<br />
5) ; leg 4 exopod third segment has 3 setae (U. collateralis,<br />
U. mycterobius, <strong>and</strong> U. ciliatus have 5, U.<br />
anonymous has 4) ; leg 4 endopod is 2-segmented (in<br />
all other species it is 3-segmented).<br />
Males <strong>of</strong> U. reductus differ from others <strong>of</strong> the genus<br />
by the following characters: the ventral surface <strong>of</strong><br />
the last abdominal segment is ornamented by only 2<br />
distal rows <strong>of</strong> minute spinules; the caudal rami have<br />
no ornamentation on the ventral surface (other males<br />
have a patch <strong>of</strong> hairs on the ventral surface <strong>of</strong> each<br />
ramus). Legs 3, 4, <strong>and</strong> 5 are strikingly similar to those<br />
<strong>of</strong> the female, while the legs <strong>of</strong> males <strong>of</strong> others in<br />
the genus differ in several ways from their female<br />
conspecifics.<br />
Unicolax reductus is the only member <strong>of</strong> the genus<br />
found on Katsuwonus pelamis <strong>and</strong> is probably restricted<br />
to that host species.<br />
Because <strong>of</strong> the number <strong>and</strong> nature <strong>of</strong> its unique<br />
characteristics, it is the most easily identified member<br />
<strong>of</strong> the genus.<br />
Ceratacolax Vervoort, 1965<br />
Ceratacolax enthynni Vervoort, 1965<br />
FIGURES 27-31, 100, 122c-/, 123-125<br />
Ceratacolax euthynni Vervoort, 1965:26.<br />
MATERIAL EXAMINED.—34 collections containing<br />
94 9 <strong>and</strong> 63 S from the following hosts <strong>and</strong> localities:
NUMBER 3 1 1 19<br />
Euthynnus alletteratus from Massachusetts, New<br />
Jersey, Florida (west coast), <strong>and</strong> Ghana; Sarda sarda<br />
from Massachusetts, Rhode Isl<strong>and</strong>, Chesapeake Bay,<br />
Florida (east <strong>and</strong> west coasts), Mississippi, Texas,<br />
Venezuela, Brazil, Spain (Cadiz), Gulf <strong>of</strong> Guinea,<br />
<strong>and</strong> South Africa (Port Elizabeth). All collections<br />
from the nasal sinuses <strong>of</strong> the hosts.<br />
Vervoort provided a good discription <strong>of</strong> both the<br />
male <strong>and</strong> female <strong>of</strong> this species. We have figured both<br />
sexes completely <strong>and</strong> will comment only on those<br />
characteristics not included in, or which differ from,<br />
Vervoort's description.<br />
FEMALE.—Ventral surface <strong>of</strong> last abdominal segment<br />
<strong>and</strong> caudal rami (Figure 27d) with patches <strong>of</strong><br />
prominent spinules (omitted by Vervoort). Leg 1<br />
(Figure 286) exopod 2-segmented (Vervoort indicated<br />
1), second segment incompletely divided; first segment<br />
with one crenate spine on outer distal corner,<br />
second segment with 3 outer spines (omitted by Vervoort)<br />
<strong>and</strong> 6 inner to terminal setae.<br />
MALE.—Ventral surface <strong>of</strong> last abdominal segment<br />
<strong>and</strong> caudal rami with patches <strong>of</strong> spinules as indicated<br />
in Figures 27c <strong>and</strong> d (Vervoort omitted spinules on<br />
caudal rami). Legs 1-3 (Figures 30c, 30rf, 31a) endopod<br />
third segment, second from innermost seta with<br />
row <strong>of</strong> 4-5 long, slender spinules along proximal outer<br />
edge (spinules omitted by Vervoort).<br />
REMARKS.—This bomolochid can be easily separated<br />
from other known members <strong>of</strong> the family on the<br />
basis <strong>of</strong> the following characteristics. The structure <strong>of</strong><br />
the first antenna is unique by the presence <strong>of</strong> a long,<br />
curved, heavily sclerotized dorsal hook situated at the<br />
junction <strong>of</strong> the first <strong>and</strong> second segments; this hook<br />
is in addition to the usual row <strong>of</strong> 15 plumose setae on<br />
the basal segments <strong>and</strong> apparently does not represent<br />
a modified seta or setae as in some other bomolochid<br />
genera. The genital segment includes 3 flap<strong>like</strong> structures<br />
at the area <strong>of</strong> egg sac attachment; within these<br />
structures are 3 spinulose setae (not easily visible without<br />
dissection) representing leg 6. Leg 2 exopod <strong>and</strong><br />
both rami <strong>of</strong> legs 3 <strong>and</strong> 4 are characterized by patches<br />
<strong>of</strong> stout spinules along outer edges, <strong>and</strong> by setae that<br />
are spinulose rather than plumose. Leg 4 endopod is<br />
conspicuously elongate, especially the terminal segment.<br />
Males are characterized by a first leg that is neither<br />
flattened nor modified as in the female. Legs 2 <strong>and</strong> 3<br />
endopod second segment both have 2 inner setae.<br />
The setae <strong>of</strong> the male legs are all plumose in contrast<br />
to the spinulose setae <strong>of</strong> the female. Perhaps the most<br />
unique feature <strong>of</strong> the male is the presence <strong>of</strong> long<br />
slender spinules on the base <strong>of</strong> one seta on each<br />
endopod last segment <strong>of</strong> legs 1-3.<br />
In both sexes there is some individual variation in<br />
the pattern <strong>of</strong> spinules <strong>of</strong> patches on the last abdominal<br />
segment <strong>and</strong> caudal rami. In the female, particularly,<br />
spinules on the caudal rami may appear as a<br />
single longitudinal row or as a patch <strong>of</strong> 2-3 rows.<br />
We could not correlate this variation to host or geographic<br />
distribution. The variation seems to occur<br />
r<strong>and</strong>omly with occasional variation on the same individual<br />
from right to left ramus.<br />
Nothobomolochus Vervoort, 1962<br />
Nothobomolochus kanagurta (Pillai, 1965),<br />
new combination<br />
FIGURES 32, 33, 100<br />
Bomolochus kanagurta Pillai, 1965:51.<br />
MATERIAL EXAMINED.—5 collections containing 9 9<br />
from the gills <strong>of</strong> Rastrelliger kanagurta from China,<br />
India (Madras), Red Sea; R. faughni from the<br />
Philippines.<br />
FEMALE.—Body form as in Figure 32a. Total length<br />
1.50 mm. Abdomen 3-segmented, segments measure<br />
118 X 206 /an, 95 X 195 /an, 95 X 177 pin, length<br />
by width respectively. Last abdominal segment (Figure<br />
32b) with 2 oblique patches <strong>of</strong> spinules. Caudal<br />
rami (see Figure 326) about twice as long as wide<br />
(94 X 55 jan); each ramus with a lateral seta, 2 subterminal<br />
<strong>and</strong> 2 terminal setae, one <strong>of</strong> which is much<br />
larger, its base nearly as wide as distal end <strong>of</strong> ramus.<br />
First antenna (Figure 32c) with 3 modified setae on<br />
basal segment, outer 2 longer than more heavily<br />
sclerotized middle seta; remaining setae <strong>of</strong> usual<br />
bomolochid type; an aesthete on each <strong>of</strong> last 2 segments.<br />
Second antenna with rows <strong>of</strong> hooklets on second<br />
segment <strong>and</strong> armed with terminal setae typical<br />
<strong>of</strong> the genus. Oral appendages typical bomolochid.<br />
Maxilliped (Figure 32d) with recurved hook bearing<br />
a short, blunt-tipped accessory process, base armed<br />
with 3 prominent plumose setae.<br />
Legs 1-4 biramous, each ramus 3-segmented. Leg 1<br />
endopod with broad segments as in other bomolochids.<br />
Leg 2 (Figure 33a) coxopod with a group <strong>of</strong> long<br />
spinules on outer distal corner <strong>and</strong> a row <strong>of</strong> short
20<br />
spinules at articulation with basipod; basipod with a<br />
cluster <strong>of</strong> long spinules arranged in a circle near inner<br />
margin <strong>and</strong> a long, stout seta at outer distal corner;<br />
exopod first segment with a patch <strong>of</strong> long spinules<br />
along outer margin <strong>and</strong> a heavy serrated spine at<br />
outer distal corner, second segment with serrated spine<br />
at outer distal corner <strong>and</strong> an inner seta, third segment<br />
with 3 serrated spines, a fringed terminal spine,<br />
<strong>and</strong> 5 terminal to inner setae (last 5 spines armed on<br />
1 margin only) ; endopod first 2 segments each with<br />
a row <strong>of</strong> spinules on distal margin in addition to usual<br />
inner setae, last segment with 2 short, outer, lightly<br />
fringed spines <strong>and</strong> 3 terminal setae. Leg 3 (Figure<br />
336) coxopod with a row <strong>of</strong> stout spinules at outer<br />
distal corner; basipod with 3 patches <strong>of</strong> spinules (outer<br />
2 fine, inner patch heavier) <strong>and</strong> a seta on outer distal<br />
corner; exopod similar to leg 2 except no spinules on<br />
first segment <strong>and</strong> 1 less spine on last segment; endopod<br />
as in leg 2 except 1 less seta on last segment. Leg 4<br />
(Figure 33c) as in leg 3 except 1 less patch <strong>of</strong> fine<br />
spinules on basipod; 1 less spine <strong>and</strong> seta on exopod<br />
last segment; endopod patches <strong>of</strong> spinules larger,<br />
setae with short spinules rather than usual plumosities,<br />
last segment with only 1 long seta. Leg 5 (Figure 33d)<br />
with 2 prominent patches <strong>of</strong> spinules in distal third,<br />
innermost with longer spinules; 1 lateral, naked seta<br />
<strong>and</strong> 3 terminal setae, outer 2 finely spinulose (all setae<br />
<strong>of</strong> about equal length).<br />
MALE.—We did not collect males <strong>of</strong> this species<br />
but Pillai noted (1965:53) that the second segment<br />
<strong>of</strong> the maxilliped bears 2 rows <strong>of</strong> "tubercles" on inner<br />
margin.<br />
REMARKS.—This species has been collected only<br />
from species <strong>of</strong> Rastrelliger from the Indo-West<br />
Pacific.<br />
Orbitacolax Shen, 1957<br />
Orbitacolax aculeatus (Pillai, 1962),<br />
new combination<br />
FIGURES 34, 35a-b, 100<br />
Bomolochus aculeatus Pillai, 1962a: 610.<br />
MATERIAL EXAMINED.—2 collections containing<br />
15 9 from the nasal sinuses <strong>of</strong> 2 Rastrelliger faughni<br />
from Manila <strong>and</strong> Lingayan Gulf, Philippines.<br />
FEMALE.—Body form as in Figure 34a. Total length<br />
1.71 mm. Greatest width 0.73 mm. Rostrum protrud-<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
ing from between bases <strong>of</strong> first antennae <strong>and</strong> bearing<br />
a pair <strong>of</strong> ventral hooks (see Figure 346).<br />
Abdomen 3-segmented, ventral surface covered with<br />
spinules. Caudal rami about twice as long as wide,<br />
each with one lateral, 2 subterminal, <strong>and</strong> 3 terminal<br />
setae (innermost much stouter <strong>and</strong> longer than<br />
others). First antenna (Figure 346) bearing 15<br />
plumose <strong>and</strong> 6 naked setae along outer edge <strong>and</strong> 1<br />
plumose <strong>and</strong> 3 naked setae directed posteriorly on<br />
first 3 segments, fourth <strong>and</strong> fifth segments with 3 setae<br />
each, last segment with 7 short <strong>and</strong> 1 long terminal<br />
setae. Second antenna (Figure 34c) with 6 rows <strong>of</strong><br />
small hooks along outer edge <strong>of</strong> second segment <strong>and</strong><br />
6 setae at tip (Pillai indicates 5). Labrum with 2<br />
dense patches <strong>of</strong> spatulate spinules, posterior corners<br />
produced as spinulose knobs. Other oral appendages<br />
as in Figure 34d. Maxilliped (Figure 34e) hook with<br />
accessory process, posterior edge <strong>of</strong> basal segment with<br />
spinules (not indicated by Pillai).<br />
We will not repeat a full description <strong>of</strong> legs 1-5 but<br />
rather restrict our discussion to those points where our<br />
material differs with the description <strong>of</strong> Pillai's. Pillai<br />
illustrated the basipod <strong>of</strong> leg 1 with 1 large patch <strong>of</strong><br />
spinules; in our specimens there are 2 (see Figure 34/).<br />
Leg 2 as described by Pillai except endopod second<br />
segment with 2 setae rather than one. Leg 3 exopod<br />
similar to that <strong>of</strong> leg 2; endopod first <strong>and</strong> second segments<br />
each with one inner seta, third segment with 2<br />
naked subequal outer spines <strong>and</strong> 2 inner setae. Pillai<br />
shows no setae on first <strong>and</strong> second segments <strong>and</strong> only<br />
one outer spine on third segment. Legs 4 <strong>and</strong> 5 (Figure<br />
35a,6) as described by Pillai.<br />
REMARKS.—In spite <strong>of</strong> the differences between our<br />
material <strong>and</strong> the description given by Pillai we feel<br />
certain that we are dealing with the same species as<br />
the same genus <strong>of</strong> host is involved in both cases. So<br />
far this copepod has been collected only from Rastrelliger<br />
from India <strong>and</strong> the Philippines.<br />
Pumiliopes Shen, 1957<br />
Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, 1973<br />
FIGURES 35c-e, 36, 37, 100, 126a-c<br />
Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, 1973:1.<br />
MATERIAL EXAMINED.—23 collections containing<br />
35 5 from the orbits <strong>of</strong> the following hosts <strong>and</strong> localities:<br />
Rastrelliger kanagurta the Red Sea, Sri Lanka,
NUMBER 311 21<br />
India (Madras), western Indian Ocean, Philippines,<br />
Java; R. faughni from Philippines; Scomber japonicus<br />
from Gulf <strong>of</strong> Guinea, Mauritania, Zanzibar; S. australasicus<br />
from Philippines.<br />
FEMALE.—Body form as in Figure 35c. Total length<br />
<strong>of</strong> holotype 1.53 mm, greatest width 0.75 mm. Cephalon<br />
about as long as wide. Genital segment (Figure<br />
35d) wider than long. Abdomen (see Figure 35
22 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
as in Figure 38c. Maxilliped absent.<br />
Leg 1 (Figure 38rf) biramose; exopod 2-segmented,<br />
first segment with a short toothed spine on outer distal<br />
corner, second segment with 4 toothed spines <strong>and</strong> 3<br />
weak setae along inner margin; endopod 3-segmented,<br />
first segment unarmed, a non-articulated spine on<br />
outer distal corner <strong>of</strong> second segment, last segment<br />
with 2 non-articulated terminal spines <strong>and</strong> a small<br />
seta on inner margin. Leg 2 (Figure 39a) as in leg 1<br />
except one less spine <strong>and</strong> seta on exopod last segment<br />
<strong>and</strong> an additional seta on endopod last segment. Leg 3<br />
(Figure 39b) 1-segmented, bearing a spine on inner<br />
distal corner <strong>and</strong> 2 short terminal setae. Legs 4, 5, <strong>and</strong><br />
6 absent.<br />
Egg sacs typically cyclopoid.<br />
MALE.—Body form as in Figure 38a. All males<br />
collected were attached to females. Body segmentation<br />
well defined. Abdomen 4-segmented. Caudal rami as<br />
in female.<br />
First antenna 8-segmented each with short setae.<br />
Second antenna (Figure 39c) 3-segmented; first segment<br />
with 2 short setae on inner margin, second segment<br />
with a seta on outer distal comer <strong>and</strong> 3 setae on<br />
a sclerotized ridge at inner distal corner, third segment<br />
in form <strong>of</strong> a bifurcate claw with an accessory spine<br />
near base. Legs 1-3 similar to female except last<br />
exopod segment <strong>of</strong> leg 2 with a long, heavily sclerotized<br />
spine (Figure 39d).<br />
REMARKS.—This species so far has been collected<br />
only from species <strong>of</strong> Scomberomorus from the western<br />
Atlantic. For a more complete description the reader<br />
should consult the original description (Cressey, 1975).<br />
Shiinoa occlusa Rabat a, 1968<br />
FIGURES 39e-h, 101, \2U-f, 127-128a,fc<br />
Shiinoa occlusa Kabata, 1968a:497.<br />
MATERIAL EXAMINED.—21 collections containing<br />
41 9 11 $ from the nasal lamellae <strong>of</strong> the following<br />
hosts <strong>and</strong> localities: Grammatorcynus bicarinatus from<br />
North Celebes, Solomon Isl<strong>and</strong>s, Palau, Caroline Isl<strong>and</strong>s;<br />
Gymnosarda unicolor from Solomon Isl<strong>and</strong>s;<br />
Scomberomorus commerson from Mozambique, Pakistan,<br />
Gulf <strong>of</strong> Thail<strong>and</strong>, Solomon Isl<strong>and</strong>s, Philippines,<br />
Palau; S. guttatus from China; S. niphonius from<br />
Japan; S. queensl<strong>and</strong>icus from Papua; S. tritor from<br />
Canary Isl<strong>and</strong>s; Acanthocybium sol<strong>and</strong>ri from Kapingarmarangi<br />
Atoll.<br />
When Kabata described this species he stated that<br />
his description was based on an immature female. The<br />
first author examined that specimen during the course<br />
<strong>of</strong> another study <strong>and</strong> compared some <strong>of</strong> the present<br />
material with it. It was concluded that Kabata's specimen<br />
was a nonovigerous female adult. We have found<br />
no differences between the specimens reported here<br />
<strong>and</strong> Kabata's description except for the presence <strong>of</strong><br />
egg sacs on some <strong>of</strong> our specimens. We will point out<br />
the differences between this species <strong>and</strong> S. inauris<br />
rather than repeat a full description here. We have,<br />
however, provided several SEM photographs <strong>of</strong> a<br />
female S. occlusa (from Gymnosarda unicolor). Females<br />
<strong>of</strong> S. occlusa can be distinguished from S. inauris<br />
by the following: the abdomen <strong>of</strong> S. occlusa is<br />
about one-sixth <strong>of</strong> the total body length (one-third in<br />
S. inauris) ; the exopods <strong>of</strong> legs 1 <strong>and</strong> 2 <strong>of</strong> S. occlusa<br />
are 3-segmented (2-segmented in S. inauris). Males<br />
<strong>of</strong> the 2 species can be separated by the following<br />
characters: distal segment <strong>of</strong> the second antenna <strong>of</strong><br />
S. occlusa with 3 claw<strong>like</strong> terminal spines (a bifid<br />
claw in S. inauris); 3-segmented exopods <strong>of</strong> legs 1<br />
<strong>and</strong> 2 <strong>of</strong> S. occlusa (2-segmented in S. inauris); 2<br />
stout, but unequal, spines at tip <strong>of</strong> leg 2 exopod <strong>of</strong><br />
S. occlusa (1 stout spine in S. inauris).<br />
REMARKS.—This species is very similar to S. inauris<br />
but easily separated by the characters cited above. The<br />
species so far has been collected from the Western<br />
Pacific, Indian Ocean, <strong>and</strong> Eastern Atlantic. It should<br />
be pointed out that a third species (S. elagata Cressey,<br />
1976) has been described from the carangid Elagatus<br />
bipinnulata (Quoy <strong>and</strong> Gaimard) from the Western<br />
Pacific.<br />
Caligus Muller, 1785<br />
Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, 1861<br />
FIGURES 40, 41a-6, 102; 128c-/, 129, 130<br />
Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, 1861:352.<br />
Caligus scutatus Milne-Edwards, 1840:453.<br />
Caligus thymni Dana 1852:56.<br />
Caligus bengoensis Scott, 1894:130.<br />
Caligus aliuncus Wilson, 1905:576.<br />
Caligus elongatus Heegaard, 1943:11.<br />
Caligus tesserifer Shiino, 1952:89.<br />
MATERIAL EXAMINED.—138 collections containing<br />
316 9 <strong>and</strong> 281 $ from the body surface <strong>and</strong> gills <strong>of</strong><br />
the following hosts <strong>and</strong> localities: Acanthocybium
NUMBER 3 1 1 23<br />
sol<strong>and</strong>ri from northeast coast <strong>of</strong> Malagasy Republic,<br />
Auxis species from Gulf <strong>of</strong> Guinea; Euthynnus alletteratus<br />
from Puerto Rico (Atlantic) ; Katsuwonus<br />
pelamis from northwest Malagasy Republic, Christmas<br />
Isl<strong>and</strong> (Pacific), Peru, Ecuador, east coast <strong>of</strong> United<br />
States (several localities), Puerto Rico (Atlantic),<br />
Venezuela, Brazil (north coast), Cape Verde Isl<strong>and</strong>s,<br />
Gulf <strong>of</strong> Guinea; Thunnus alalunga from New Jersey;<br />
Thunnus albacares from Christmas Isl<strong>and</strong> (Pacific),<br />
east coast <strong>of</strong> United States (several localities), Brazil,<br />
Gulf <strong>of</strong> Guinea; Thunnus atlanticus from Puerto Rico<br />
(Atlantic); Thunnus obesus from Christmas Isl<strong>and</strong><br />
(Pacific), east coast <strong>of</strong> United States (several localities),<br />
Surinam, Brazil (north coast), Cape Verde Isl<strong>and</strong>s;<br />
Thunnus thynnus from east coast <strong>of</strong> United<br />
States (several localities).<br />
Shiino (1959a), Pillai (1962b), <strong>and</strong> Lewis (1967)<br />
have provided good descriptions <strong>and</strong> figures for this<br />
well known species. We will restrict our consideration<br />
<strong>of</strong> this species to those characters that serve to distinguish<br />
it from the other Caligus species found on<br />
scombrid hosts.<br />
FEMALE.—Body form as in Figure 40a. Lewis, et al.<br />
(1969:423) provided morphometric data for 36<br />
specimens from 4 host species from the Indian Ocean.<br />
The average total length for his material was 5.57<br />
mm. Our material from the Indian Ocean <strong>and</strong> Pacific<br />
areas did not differ significantly from this mean. The<br />
Atlantic specimens, however, tended to be larger (5.8-<br />
6.5 mm based on 10 specimens from various localities).<br />
The cephalon comprises about one-half <strong>of</strong> the total<br />
length with the genital segment <strong>and</strong> abdomen each<br />
comprising about one-fourth.<br />
Frontal lunules widely spaced; space between lunules<br />
(1.31 mm) more than twice greatest diameter <strong>of</strong><br />
either lunule (0.58 mm).<br />
Genital segment slightly longer than wide (1.5 X<br />
1.4 mm) with posterior outer corners produced somewhat<br />
beyond origin <strong>of</strong> abdomen. Abdomen 3-segmented;<br />
1st segment constricted in posterior two-thirds<br />
giving the appearance <strong>of</strong> 2 segments, second segment<br />
shortest, third segment with 2 distal lobes separating<br />
caudal rami; segments measure 0.9, 0.3, <strong>and</strong> 0.37 mm<br />
respectively. Caudal ramus as in Figure 406.<br />
Postantennal spine lacking. Postoral spine wide at<br />
base, triangular. Sternal furca (Figure 40c) with<br />
short, widely divergent tines; furca with an accessory<br />
sclerotized cuticular process on each side.<br />
Leg 1 (Figure 40rf) basipod with a patch <strong>of</strong> short<br />
spinules, patches <strong>of</strong> longer hairs, a short plumose seta<br />
on inner margin, a long, very plumose, seta at outer<br />
distal corner; exopod 3 distal spines each with prominent<br />
fringes, inner 2 with accessory process; endopod<br />
reduced to a short, sclerotized process. Leg 2 endopod<br />
(Figure 40e) with patches <strong>of</strong> long spinules on outer<br />
margin <strong>of</strong> each segment. Leg 3 exopod (Figure 40/)<br />
with prominent thumb<strong>like</strong> spine on outer distal corner<br />
<strong>of</strong> first segment, each <strong>of</strong> last 2 segments with long<br />
setules on outer margin in addition to usual spines <strong>and</strong><br />
setae. Leg 4 exopod (Figure 41a) 3-segmented, first<br />
<strong>and</strong> second segment each with a prominent fringed<br />
spine on outer distal corner; last segment with 3<br />
fringed spines, distalmost longest, all spines with a<br />
fringe at base; spines measure 366, 236, 153, 206, <strong>and</strong><br />
247 /un distalmost to proximalmost respectively.<br />
MALE.—Body form as in Figure 416. Total length<br />
5.3 mm. Cephalon comprises more than half total<br />
length. Appendages as in female except second antenna<br />
with accessory process on claw. Maxilliped with<br />
small sclerotized area opposite tip <strong>of</strong> claw. Sternal<br />
furca similar to female except tines not quite as divergent.<br />
Thoracic appendages as in female. Legs 5 <strong>and</strong> 6<br />
represented by setae at the posterior corners <strong>of</strong> the<br />
genital segment.<br />
REMARKS.—This species has been reported many<br />
times since its original description in 1861. It is common<br />
on the body surface <strong>of</strong> scombrids <strong>of</strong> the tribe<br />
Thunnini. The single collection from Acanthocybium<br />
sol<strong>and</strong>ri (Scomberomorini) is the only exception reported<br />
here <strong>of</strong> all scombrids examined. It is also common<br />
on species <strong>of</strong> Coryphaena <strong>and</strong> is found in all except<br />
polar oceans (see Figure 102). Margolis, Kabata,<br />
<strong>and</strong> Parker, 1975:25 provide a complete synonymy to<br />
this species.<br />
Further discussion <strong>of</strong> this species follows the description<br />
<strong>of</strong> C. regedis.<br />
Caligus regalis Leigh-Sharpe, 1930<br />
FIGURES *\c-g, 102<br />
Caligus regalis Leigh-Sharpe, 1930:5.<br />
Caligus euthynus Kurian, 1961:63.<br />
Caligus alveolaris Heegaard, 1962:156.<br />
MATERIAL EXAMINED.—5 collections containing 149<br />
5, 113 $ from the body surface <strong>of</strong> Euthynnus<br />
affinis collected <strong>of</strong>f Nosy Be, Malagasy Republic.<br />
Types <strong>of</strong> C. alveolaris (AMS P. 16408) from the
24 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
same host species, reported as E. allitteratus [sic]<br />
from north Queensl<strong>and</strong>, Australia.<br />
FEMALE.—Body form as in Figure 41c. Total length<br />
4.62 mm (4.27-4.73 mm) based on an average <strong>of</strong> 5<br />
specimens. Greatest width 2.1 mm (measured at<br />
widest part <strong>of</strong> cephalon). Cephalon comprises about<br />
one-half total body length. Genital segment somewhat<br />
longer than wide (1.77 X 1.55 mm), posterior corners<br />
produced to form rounded lobes. Abdomen 2-segmented,<br />
segments measure 1.02 <strong>and</strong> 0.43 mm long<br />
respectively, comprising about one-third total body<br />
length. Caudal rami as in Caligus coryphaenae except<br />
outer terminal seta much stouter in C. regalis.<br />
Frontal lunules widely spaced, each about 400 /*m<br />
wide, rostral space between each lunule about 950 /xrn.<br />
Cephalic appendages as in C. coryphaenae except<br />
sternal furca not as divergent in C. regalis (Figure<br />
Legs 1-4 as in C. coryphaenae; the stout spine on<br />
the first exopod segment <strong>of</strong> leg 3 (Figure 41«) is<br />
curved inwards rather than straight as in C. coryphaenae.<br />
The apical seta on the exopod <strong>of</strong> leg 4<br />
(Figure 41/) is only slightly longer than the adjacent<br />
seta, setae measure 189, 177, 177, 177, <strong>and</strong> 183 /*m<br />
distal to proximal respectively.<br />
MALE.—Body form as C. coryphaenae. Total length<br />
3.51 mm (3.37-3.53 mm) based on an average <strong>of</strong> 5<br />
specimens. Greatest width 1.73 mm (measured at<br />
widest part <strong>of</strong> cephalon). Genital segment (Figure<br />
41g) wider than long (914 X 711 /un). Caudal rami<br />
with outermost terminal seta stout <strong>and</strong> about as wide<br />
at base as other 3 (much smaller in C. coryphaenae).<br />
Legs 5 <strong>and</strong> 6 at posterior outer corners. Abdomen 2segmented,<br />
segments measure 247 <strong>and</strong> 479 /tin respectively.<br />
REMARKS.—Pillai, 1962b, discussed the relationship<br />
between this species <strong>and</strong> C. coryphaenae <strong>and</strong> provided<br />
a comprehensive description <strong>of</strong> C. regalis (as C.<br />
euthynus). All collection records to date indicate that<br />
C. regalis is specific to Euthynnus affinis <strong>and</strong> C.<br />
coryphaenae is primarily found on other species <strong>of</strong><br />
scombrids <strong>of</strong> the tribe Thunnini.<br />
These 2 species <strong>of</strong> Caligus differ from other members<br />
<strong>of</strong> the genus in lacking a postantennal process<br />
(Lewis 1967:105, considered the group <strong>of</strong> sensillae<br />
at the usual site <strong>of</strong> the postantennal process as representing<br />
the process). When the genus Caligus has<br />
undergone a much needed revision it may be that<br />
these 2 species should be removed from the genus.<br />
We have placed Heegaard's C. alveolaris <strong>and</strong><br />
Kurian's C. euthynus in synonymy with C. regalis <strong>of</strong><br />
Leigh-Sharpe. Although Leigh-Sharpe's figures are<br />
poor there is little doubt that they illustrate the copepods<br />
discussed here, especially considering that he<br />
collected his material from the same host-species (as<br />
E. yaito).<br />
Caligus productus Dana, 1852<br />
FIGURES 42-44, 103<br />
Caligus productus Dana, 1852:56.<br />
Caligus alalongae Kroyer, 1863:129.<br />
Caligus monacanthi Kroyer, 1863:133.<br />
Caligus lobatus Wilson, 1935:1.<br />
Caligus katuwo Yamaguti, 1936:6.<br />
Caligus dentatus Heegaard, 1962:160.<br />
Caligus microdontus Heegaard, 1964:139.<br />
This species has been recorded many times from<br />
scombrids <strong>and</strong> occasionally non-scombrid hosts (see<br />
Lewis, 1967:116). Shiino, 1959b <strong>and</strong> Lewis, 1967<br />
have provided good descriptions <strong>and</strong> we do not feel<br />
a need to repeat another here. We have, however,<br />
provided pertinent illustrations <strong>and</strong> a consideration<br />
<strong>of</strong> certain characters to enable the reader to identify<br />
this species without resorting to other literature. A<br />
complete synopsis <strong>of</strong> the literature has been provided<br />
by Margolis, Kabata, <strong>and</strong> Parker (1975:64).<br />
MATERIAL EXAMINED.—207 collections containing<br />
2286 9 , 657
NUMBER 3 1 1 25<br />
Republic, Mozambique Channel, Chagos Isl<strong>and</strong>s,<br />
Somalia, Palau, Line Isl<strong>and</strong>s, Brazil (north coast),<br />
Dominican Republic (Atlantic), Bermuda, east coast<br />
United States (several localities) ; Thunnus atlanticus<br />
from West Indies (several localities), Nicaragua;<br />
Thunnus thynnus from east coast United States<br />
(several localities), Gulf <strong>of</strong> Mexico, Japan.<br />
FEMALE.—Body form as in Figure 42a. Range <strong>of</strong><br />
total length (including data <strong>of</strong> Lewis 1967, 1968)<br />
3.85-5.45 mm. We did not find any significant differences<br />
in total length between our measurements <strong>of</strong><br />
Atlantic specimens <strong>and</strong> those <strong>of</strong> ours <strong>and</strong> Lewis' from<br />
the Indian <strong>and</strong> Pacific oceans. Examination <strong>of</strong> specimens<br />
from several different hosts from widely separated<br />
geographic areas revealed no significant variations<br />
in form. It appears that this is a very stable<br />
species, well established as a parasite <strong>of</strong> scombrids<br />
except members <strong>of</strong> the tribe Scombrini {Scomber <strong>and</strong><br />
Rastrelliger).<br />
Caligus productus females can be easily separated<br />
from other species <strong>of</strong> the genus by a combination <strong>of</strong><br />
the following characters: the outer distal corners <strong>of</strong><br />
the genital segment are rounded <strong>and</strong> extend well<br />
beyond the insertion <strong>of</strong> the abdomen; the ventral<br />
surface <strong>of</strong> the abdomen bears a medial subterminal<br />
patch <strong>of</strong> minute spinules <strong>and</strong> a terminal transverse<br />
patch <strong>of</strong> fine hairs (see Figure 426); the last exopod<br />
segment <strong>of</strong> leg 1 lacks the usual 3 lateral setae; the<br />
outer distal corner <strong>of</strong> the first endopod segment <strong>of</strong><br />
leg 2 bears a row <strong>of</strong> long spinules, the second segment<br />
bears a double row <strong>of</strong> stout spines (7-9 per row)<br />
along its outer edge; leg 4 exopod is 2-segmented, the<br />
last segment bearing one lateral <strong>and</strong> 3 terminal setae<br />
(outermost seta slightly longer than others).<br />
MALE.—Cephalothoracic appendages as in female<br />
except second antenna (Figure 44«) with short claw<br />
<strong>and</strong> 2 prominent bossed areas on basal segment. Genital<br />
segment <strong>and</strong> abdomen as in Figure 440*.<br />
REMARKS.—This species is common on scombrid<br />
fishes throughout the circumtropical <strong>and</strong> subtropical<br />
area. We have recorded it here from 15 species <strong>of</strong><br />
hosts, infesting the buccal area, gills <strong>and</strong> body surface.<br />
Data presented by Lewis, et al, 1969, <strong>and</strong> our own<br />
collection data indicate the parasite is most commonly<br />
found in the buccal area, next in the gill area, <strong>and</strong><br />
occasionally on the body surface. The fewer records<br />
from the body surface could result from the more<br />
exposed site <strong>and</strong> consequently the copepods more<br />
easily drop <strong>of</strong>f prior to examination <strong>of</strong> the host. Cer-<br />
tainly our own records, based in large part on the<br />
examination <strong>of</strong> preserved hosts, would be biased in<br />
that regard.<br />
Although we collected Caligus productus from 14<br />
species <strong>of</strong> scombrid fishes it is common (found on<br />
more than 25% <strong>of</strong> the specimens examined) on only<br />
4 species; Katsuwonus petamis 52%, Thunnus albacares<br />
45%, T. atlanticus 92%, <strong>and</strong> T. thynnus 28%.<br />
It is curious that, although this parasite was found<br />
on 8 <strong>of</strong> the 13 species <strong>of</strong> Thunnini, we did not<br />
collect it from any <strong>of</strong> the 40 specimens <strong>of</strong> T. obesus<br />
examined.<br />
This species was not found on any species <strong>of</strong> the<br />
tribe Scombrini (Rastrelliger <strong>and</strong> Scomber). Leigh-<br />
Sharpe (1926:384) reported this species from Scomber<br />
scombrus <strong>and</strong> placed the previously described Caligus<br />
scomberi Bassett-Smith in synonymy with it. Later<br />
writers (see Margolis, Kabata, <strong>and</strong> Parker 1975:74)<br />
<strong>and</strong> our examination <strong>of</strong> the type <strong>of</strong> Caligus scomberi<br />
agree that it is a synonym <strong>of</strong> Caligus pelamydis<br />
Kroyer, 1863 <strong>and</strong> the records <strong>of</strong> C. productus from<br />
Scomber scombrus discounted.<br />
Caligus asymmetricus Kabata, 1965<br />
FIGURES 45-47, 104<br />
Caligus asymmetricus Kabata, 1965:109.<br />
Caligus thynni Pillai, 1963:89.<br />
In addition to Pillai's original description, Lewis<br />
(1967:131) redescribed this species <strong>and</strong> presented an<br />
account <strong>of</strong> its rather confusing history. In view <strong>of</strong><br />
these recent works we will not present another full<br />
description <strong>of</strong> C. asymmetricus, but, as with some<br />
other Caligus species from scombrids, discuss only the<br />
salient features <strong>and</strong> provide full illustrations to enable<br />
the reader to identify this species without consulting<br />
the earlier works.<br />
MATERIALS EXAMINED.—22 collections containing<br />
719 <strong>and</strong> 25 $ from the gills, gill arches, <strong>and</strong> ro<strong>of</strong> <strong>of</strong><br />
the mouth (1 collection) <strong>of</strong> the following hosts <strong>and</strong><br />
localities: Grammatorcynus bicarinatus from Palau,<br />
Marshall Isl<strong>and</strong>s, Kapingamarangi Atoll; Scomberomorus<br />
commerson from New South Wales, East<br />
Indies; Sarda australis from New South Wales; Sarda<br />
orientalis from Seychelles, Hawaii; Cybiosarda elegans<br />
from western Australia; Auxis sp. from New South<br />
Wales; Euthynnus affinis from New South Wales,<br />
northwest Malagasy Republic; Katsuwonus pelamis
26<br />
from northwest Malagasy Republic; Thunnus albacares<br />
from Queensl<strong>and</strong>.<br />
FEMALE.—Body form as in Figure 45a. Range <strong>of</strong><br />
total length 3.00-4.20 mm (3.49 mm average <strong>of</strong> 22<br />
specimens). Those from Cybiosarda elegans (western<br />
Australia) averaged somewhat longer (3.78 mm <strong>of</strong> 9<br />
specimens) than those from other hosts from other<br />
areas <strong>of</strong> the Pacific <strong>and</strong> Indian oceans. Those measured<br />
from other areas <strong>and</strong> other hosts did not vary<br />
significantly.<br />
Caligus asymmetricus can be separated from other<br />
Caligus species found on scombrids by the combination<br />
<strong>of</strong> the following characters: abdomen short<br />
(about 10 percent <strong>of</strong> total length); sternal furca<br />
narrow, tines <strong>of</strong>ten asymmetrical or otherwise distorted;<br />
leg 2 endopod first segment with long spinules<br />
at outer distal corner, second segment with a row <strong>of</strong><br />
6-8 stout spines; leg 4 exopod 2-segmented, outermost<br />
seta longest, other 4 exopod setae all about equal in<br />
length to each other.<br />
MALE.—Characters described above apply to males<br />
except abdomen comprises about 15 percent <strong>of</strong> total<br />
body length.<br />
REMARKS.—Caligus asymmetricus was reported by<br />
Pillai (1963:89) from Euthynnus affinis from India,<br />
by Kabata (1965:110) from the same host (reported<br />
as E. alletteratus) from Queensl<strong>and</strong>, Australia, <strong>and</strong><br />
by Lewis (1967:131) from the same host (reported<br />
as E. yaito) from Hawaii. We record this species from<br />
9 scombrid species within the Indo-West Pacific. Although<br />
the records are scattered throughout 3 <strong>of</strong> the<br />
4 tribes <strong>of</strong> Scombrinae, our collections indicate that<br />
Indo-West Pacific species <strong>of</strong> the tribe Sardini may be<br />
preferred hosts (17 percent infestation rate on 3 host<br />
species as opposed to 4 percent infestation rate on 2<br />
species <strong>of</strong> Scomberomorini, 2 percent infestation rate<br />
on 4 species <strong>of</strong> Thunnini <strong>and</strong> no records from the<br />
5 Indo-West Pacific species <strong>of</strong> Scombrini).<br />
Kabata (1965:110) notes that both his <strong>and</strong> Pillai's<br />
specimens were collected with specimens <strong>of</strong> Caligus<br />
bonito (reported as C. kuroshio). Of the 22 collections<br />
reported here only 2 were accompanied by C. bonito,<br />
nor did we find any other species common in collections<br />
<strong>of</strong> C. asymmetricus.<br />
We found that the peculiar asymmetry or distortion<br />
<strong>of</strong> the tines <strong>of</strong> the sternal furca reported previously in<br />
the collections from India, Australia, <strong>and</strong> Hawaii did<br />
not occur in all collections but rather seems to occur<br />
r<strong>and</strong>omly within populations. The sternal furcae <strong>of</strong><br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
our specimens from Sarda orientalis from Hawaii are<br />
usually distorted, including one specimen with 1 central<br />
tine rather than the usual 2. In certain other<br />
collections the furcae were normally developed.<br />
Caligus bonito Wilson, 1905<br />
FIGURES 48-50, 105<br />
Caligus bonito Wilson, 1905:589.<br />
Caligus sarda Pearse, 1952:17.<br />
Caligus kuroshio Shiino, 1959b: 51.<br />
This species has been reported many times (see<br />
Margolis, Kabata, <strong>and</strong> Parker, 1975:18 for complete<br />
literature history) <strong>and</strong> has been recently redescribed<br />
by Pillai, 1971:161 <strong>and</strong> Lewis, 1967:124. Because<br />
<strong>of</strong> these recent good descriptions it is unnecessary to<br />
completely redescribe this species again. We discuss<br />
only certain taxonomic features that we consider important<br />
in distinguishing this species from other<br />
Caligus found on scombrid fishes. We have, however,<br />
provided illustrations so the reader can identify specimens<br />
without consulting other work.<br />
MATERIAL EXAMINED.—76 collections containing<br />
155 9 <strong>and</strong> 58 $ from the mouth <strong>and</strong> gills <strong>of</strong> the following<br />
hosts <strong>and</strong> localities: Euthynnus affinis from<br />
New South Wales; E. alletteratus from Florida (Gulf<br />
coast), Dominican Republic (Atlantic); E. lineatus<br />
from Galapagos Isl<strong>and</strong>s, Panama (Pacific), Baja California<br />
(Pacific) ; Thunnus thynnus from Florida (Atlantic)<br />
; Scomberomorus regalis from Antigua; Sarda<br />
sarda from western North Atlantic (several localities<br />
Massachusetts to Brazil); Florida (north Gulf coast),<br />
Rio de Janeiro, Norway, Tunisia, Gulf <strong>of</strong> Guinea,<br />
Angola, South Africa (Port Elizabeth) ; Sarda australis<br />
from New South Wales; Sarda chiliensis chiliensis<br />
from Peru; Sarda chiliensis lineolatus from Cedros<br />
Isl<strong>and</strong>s, California; Sarda orientalis from Red Sea<br />
(Elat), South Africa (Port Elizabeth), India<br />
(Cochin), China, Galapagos; Gymnosarda unicolor<br />
from Bikini.<br />
FEMALE.—Body form as in Figure 48fl. Total length<br />
6.45 mm. (average <strong>of</strong> 37 specimens 5.10-8.10 mm<br />
range). Measurements taken from collections from<br />
Sarda sarda, S. australis, <strong>and</strong> S. chiliensis. No significant<br />
differences could be seen between C. bonito from<br />
different host species or geographic areas, except that<br />
specimens from warmer water tend to be smaller than<br />
those from colder.
NUMBER 3 1 1 27<br />
Caligus bonito females can be easily separated from<br />
other species <strong>of</strong> the genus except Caligus omissus new<br />
species by a combination <strong>of</strong> the following characters:<br />
cephalon, genital segment, <strong>and</strong> abdomen each comprising<br />
about one-third <strong>of</strong> the body length (abdomen<br />
widest anteriorly), endopod first <strong>and</strong> second segments<br />
<strong>of</strong> leg 2 with a group <strong>of</strong> prominent spinules at outer<br />
distal corner <strong>and</strong> a double row <strong>of</strong> stouter spinules<br />
along outer edge respectively (see Figures 49e,f), tines<br />
<strong>of</strong> sternal furca (Figure 49c) nearly parallel <strong>and</strong> blunt<br />
tipped, lateral setae <strong>of</strong> leg 1 exopod last segment with<br />
stout spinules on basal fourth (see Figure 49d), leg<br />
4 exopod 2-segmented with terminalmost seta about<br />
twice as long as others. See discussion <strong>of</strong> characters<br />
separating C. bonito from C. omissus new species in<br />
the description <strong>of</strong> the new species.<br />
MALE.—Body form as in Figure 50c. Total lengths<br />
<strong>of</strong> males are approximately 80 percent that <strong>of</strong> the<br />
females in any collection. The ranges would be proportionately<br />
the same as given for the females. Male<br />
as in female except in the following characters:<br />
abdomen 2-segmented; second antenna (Figure 50d)<br />
second segment with 2 rugose areas, claw with 2 short<br />
processes at tip <strong>and</strong> a seta on inner margin; maxilliped<br />
(Figure 50«) basal segment with sclerotized bifid knob<br />
on margin opposite tip <strong>of</strong> claw.<br />
DISCUSSION.—We have recorded this species here<br />
from 11 scombrid species. From our data Caligus<br />
bonito seems to be primarily a parasite <strong>of</strong> scombrids<br />
<strong>of</strong> the tribe Sardini (collected from 7 species) ; to a<br />
lesser extent a parasite <strong>of</strong> species <strong>of</strong> Thunnini (from<br />
4 species) ; rarely found on members <strong>of</strong> the Scomboromorini<br />
(1 species) ; not found on the tribe<br />
Scombrini (Rastrelliger <strong>and</strong> Scomber). It is recorded<br />
from all except polar oceans <strong>and</strong> previous<br />
records are cited by Lewis (1967:125) (including<br />
nonscombrid hosts).<br />
Lewis (1967:131) discussed the difficulties distinguishing<br />
this species from Caligus productus <strong>and</strong><br />
C. quadratus Shiino. Although these 3 species superficially<br />
resemble each other, the nature <strong>of</strong> the armature<br />
on the first, second, <strong>and</strong> fourth legs should easily<br />
separate them. Caligus quadratus is easily separated<br />
from C. productus by the normally developed setae<br />
on the leg 1 exopod <strong>of</strong> C. quadratus (absent in C.<br />
productus) <strong>and</strong> from C. bonito by the stout spinules<br />
present on these same setae <strong>of</strong> C. bonito (normal<br />
plumosities on C. quadratus).<br />
After examining the type-specimens <strong>of</strong> Caligus sarda<br />
Pearse (USNM 92667) we have placed it in synonymy<br />
with Caligus bonito Wilson.<br />
Caligus mutabilis Wilson, 1905<br />
FIGURES 51, 52, 53a-b, 105<br />
Caligus mutabilis Wilson, 1905:573.<br />
MATERIAL EXAMINED.—8 collections containing 8 2<br />
from the gills or gill chambers <strong>of</strong> Scomberomorus<br />
brasiliensis from Brazil <strong>and</strong> Costa Rica; S. cavalla<br />
from Surinam; S. maculatus from west coast <strong>of</strong><br />
Florida; Scomber japonicus from Campeche.<br />
FEMALE.—Body form as in Figure 51a. Total length<br />
2.78 mm. Greatest width 1.12 mm. Frontal lunules<br />
large, greatest width <strong>of</strong> lunule more than least distance<br />
between each lunule (307 vs 254 fan). Genital segment<br />
(Figure 516) longer than wide (986 X 725 /*m),<br />
widest posteriorly, posterior corners rounded <strong>and</strong> only<br />
slightly produced. Abdomen (see Figure 516) incompletely<br />
divided into 2 segments, about twice as long<br />
as wide (681 X 362 fin), posterior ventral surface<br />
with patches <strong>of</strong> spinules as in Figure 51c. Caudal<br />
rami (Figure 51c) longer than wide (159 X 106 /an)<br />
bearing 6 plumose setae as indicated in figure.<br />
Oral area as in Figure 52c. First antenna (Figure<br />
5ld) first segment with 27 setae (all but 2 are plumose),<br />
last segment with 13 naked setae. Second<br />
antenna (Figure 51/) with spatulate posterior process,<br />
otherwise <strong>of</strong> usual form <strong>of</strong> genus. Maxillae <strong>and</strong> maxilliped<br />
as in Caligus bonito. Sternal furca (Figure 52b)<br />
tines slightly divergent, blunt tipped.<br />
Leg 1 (Figure 52d) basipod with large patch <strong>of</strong><br />
fine spinules <strong>and</strong> 2 plumose setae; exopod first segment<br />
with row <strong>of</strong> spinules on inner edge <strong>and</strong> short<br />
spine at outer distal corner, second segment with 3<br />
terminal spines (2 with accessory processes), a terminal<br />
seta plumose on outer edge <strong>and</strong> 3 lateral setae,<br />
each with outer edge armed with stout spinules at<br />
base becoming finer toward tip <strong>and</strong> short plumosities<br />
along inner edge. Leg 2 (Figure 52«) exopod similar<br />
to other species <strong>of</strong> genus, endopod first segment with<br />
a patch <strong>of</strong> long spinules at outer distal corner, second<br />
segment with a dense patch <strong>of</strong> long spinules along<br />
outer edge, last segment with 3-4 shorter spinules at<br />
proximal outer edge, all segments with plumose setae<br />
as in figure. Leg 3 (Figure 53a) similar to other<br />
species <strong>of</strong> genus, thumb<strong>like</strong> spine at outer distal corner<br />
<strong>of</strong> exopod first segment only slightly recurved. Leg 4
28 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
(Figure 536) exopod 2-segmented, first segment with<br />
prominent spine at outer distal corner, second segment<br />
with 3 terminal <strong>and</strong> 1 lateral spine, distalmost longest<br />
(setae measure 177, 112, 83, 83, 124 fim distal to<br />
proximal respectively). Leg 5 represented by 3 short<br />
setae near posterior corner <strong>of</strong> genital segment.<br />
MALE.—None collected.<br />
REMARKS.—This species is apparently common on<br />
a number <strong>of</strong> host species in the western Atlantic <strong>and</strong><br />
Gulf <strong>of</strong> Mexico (scombrid <strong>and</strong> non-scombrid). It<br />
has also been reported from the Gulf <strong>of</strong> California<br />
<strong>and</strong> Pacific coast <strong>of</strong> Mexico from a number <strong>of</strong> host<br />
species by Causey (1960:329) <strong>and</strong> Wilson (1937:27).<br />
We describe here a new, closely related, species <strong>of</strong><br />
Caligus from eastern Pacific Scomberomorus <strong>and</strong> it<br />
seems <strong>like</strong>ly that at least some <strong>of</strong> the specimens reported<br />
by these 2 authors may have been the new<br />
species. None <strong>of</strong> that material has been deposited in<br />
the Smithsonian collections so we have not been able<br />
to verify the identifications.<br />
Examination <strong>of</strong> the type-specimens (USNM 6155)<br />
from Woods Hole, Mass, indicate variation from our<br />
specimens on at least 2 points. The outermost <strong>of</strong> the<br />
4 terminal setae on the caudal rami <strong>of</strong> the type specimens<br />
is less than half the length <strong>of</strong> the outer edge <strong>of</strong><br />
the ramus, whereas in our specimens that seta is<br />
almost as long as the outer edge <strong>of</strong> the ramus. The<br />
longest seta on the exopod <strong>of</strong> leg 4 <strong>of</strong> the type specimens<br />
is only slightly longer than the adjacent seta<br />
(218 <strong>and</strong> 177 /*m) whereas in our material this seta<br />
is much longer than the adjacent seta (177 in 112<br />
/*m). We do not consider these differences important<br />
enough to warrant describing a new species but rather<br />
may reflect ecological differences between the 2 groups<br />
<strong>of</strong> material.<br />
Caligus omissus, new species<br />
FIGURES 53c-e, 54-56, 105<br />
MATERIAL EXAMINED.—58 collections containing<br />
147 9 41 S from the gills, gill arches, gill rakers, inner<br />
operculum, <strong>and</strong> ro<strong>of</strong> <strong>of</strong> the mouth from 41 specimens<br />
(114 examined) <strong>of</strong> Scomberomorus sierra from Peru,<br />
Colombia, Panama, Costa Rica, Pacific coast <strong>of</strong> Mexico,<br />
<strong>and</strong> Baja California; from 7 specimens (47 examined)<br />
<strong>of</strong> Scomberomorus concolor from <strong>of</strong>f Sonora,<br />
Mexico <strong>and</strong> Gulf <strong>of</strong> California. Holotype (USNM<br />
172239), allotype (USNM 172240) <strong>and</strong> 40$ 3*<br />
paratypes (USNM 172241) from the gills <strong>of</strong> S. sierra<br />
from San Juan Lagoon, Mexico (USNM 219623).<br />
FEMALE.—Body form as in Figure 53c. Total length<br />
2.96 mm (2.78-308 mm) based on an average <strong>of</strong> 6<br />
specimens from the type series. Greatest width 1.15<br />
mm (1.12-1.19). Cephalon comprises about 40 percent<br />
<strong>of</strong> total length. Frontal lunules prominent,<br />
diameter <strong>of</strong> lunule (266 /*m) slightly more than<br />
least distance (218 /*m) between lunules (interlunular<br />
space). Genital segment (Figure 53d) slightly longer<br />
than wide (1.16 X 1-09 mm), posterior corners<br />
rounded, only slightly produced, comprising about 30<br />
percent <strong>of</strong> total length. Abdomen (see Figure 53d)<br />
1-segmented, nearly 3 times as long as wide (0.96 X<br />
0.36 mm), usually slightly wider in posterior third<br />
but never noticeably wider in anterior half; distal<br />
ventral surface with patches <strong>of</strong> spinules as in Figure<br />
53*. Caudal rami (see Figure 53e) longer than wide<br />
(142 X 94 fixn) armed with 6 plumose setae as indicated<br />
in figure, longest seta 307 /*m.<br />
Oral area as in Figure 54a. First antenna (Figure<br />
546) first segment with 27 setae, all plumose except<br />
2 in middle anterior group; last segment with 13<br />
naked setae. Second antenna (Figure 54rf) with<br />
prominent hook, basal segment with conspicuous<br />
pointed posterior process. Post antennal process (Figure<br />
54c) a prominent recurved hook. Postoral process<br />
(Figure 54e) with slight outward curve, extending<br />
well beyond tip <strong>of</strong> mouth tube. Maxilliped (Figure<br />
54/) with a strongly sclerotized, recurved claw.<br />
Sternal furca (Figure 54g) with widely divergent<br />
tines, each with a blunt tip.<br />
Leg 1 (Figure 55a) basipod with a patch <strong>of</strong><br />
prominent spinules covering two-thirds <strong>of</strong> ventral<br />
surface; exopod first segment with row <strong>of</strong> spinules<br />
along inner edge <strong>and</strong> short, naked spine on outer<br />
distal corner; exopod with 3 terminal spines (2 with<br />
accessory spines), 1 terminal seta (plumose on outer<br />
edge), <strong>and</strong> 3 lateral setae with stout spinules on base<br />
<strong>of</strong> outer edge <strong>of</strong> each followed by short plumosities;<br />
endopod reduced to a short process with 2 small distal<br />
spines. Leg 2 (Figure 556) as in other species <strong>of</strong> the<br />
genus except exopod spine on outer distal corner <strong>of</strong><br />
last segment very small; endopod first segment with<br />
3-4 stout spinules on outer distal corner, second segment<br />
with a double row <strong>of</strong> stout spinules along outer<br />
edge, a patch <strong>of</strong> 4-5 short spinules on proximal outer<br />
edge <strong>of</strong> last segment, all segments with plumose setae<br />
as in figure. Leg 3 (Figure 55c) basipod with con-
NUMBER 3 1 1 29<br />
spicuous spinules on outer quarter <strong>and</strong> a patch <strong>of</strong><br />
finer spinules at inner, proximal corner; endopod first<br />
segment with stout, recurved claw on outer distal<br />
corner, a short spine on outer distal corner <strong>of</strong> second<br />
segment, 3 short spines on outer edge <strong>of</strong> last segment<br />
<strong>and</strong> each segment with plumose setae as in figure;<br />
endopod with plumose setae as indicated in figure.<br />
Leg 4 (Figure 55d) exopod 2-segmented, first segment<br />
with a prominent spine on outer distal corner, second<br />
segment with one lateral spine <strong>and</strong> 3 terminal spines,<br />
distalmost spine longest, spines measure 201, 124, 106,<br />
100, <strong>and</strong> 130 /tun distal to proximal spine respectively.<br />
Leg 5 represented by 3 short plumose setae near<br />
distal corner <strong>of</strong> genital segment.<br />
MALE.—Body form as in Figure 56a. Total length<br />
3.15 mm (3.08-3.23 mm), based on an average <strong>of</strong><br />
2 specimens. Greatest width 1.27 mm. Cephalon comprising<br />
about one-half total length. Genital segment<br />
(Figure 566) longer-than wide (884 X 580 /an).<br />
Abdomen (Figure 566) 2-segmented, first segment<br />
nearly square (348 X 348 /*m), second segment longer<br />
than wide (449 X 334 /*m) with ventral patches <strong>of</strong><br />
spinules as in female. Caudal ramus as in female.<br />
Appendages as in female except as follows. Postantennal<br />
process (Figure 56d) a prominent, sharply<br />
recurved, hook. Second antenna (Figure 56c) with<br />
2 rugose areas on basal segment <strong>and</strong> a short bifid claw.<br />
Maxilliped (Figure 56/) basal segment with a pair <strong>of</strong><br />
sclerotized processes on inner margin opposite tip <strong>of</strong><br />
claw. Sternal furca (Figure 56g) with tines less<br />
divergent than female.<br />
Legs 1-4 as in female. Legs 5 <strong>and</strong> 6 each represented<br />
by 2 short plumose setae on the genital segment<br />
as in Figure 566.<br />
ETYMOLOGY.—The Latin omissus ("neglected")<br />
alludes to its common association with eastern Pacific<br />
Scomberomorus species but not collected or, if so,<br />
not recognized as new.<br />
REMARKS.—This new species seems to be closely<br />
related to Caligus mutabilis <strong>and</strong> C. bonito to a lesser<br />
extent. These 3 Caligus share a number <strong>of</strong> characters:<br />
the similar pattern <strong>of</strong> fine spinule patches on the<br />
distal-ventral surface <strong>of</strong> the abdomen, a prominent<br />
posterior process arising from the base <strong>of</strong> the second<br />
antennae, inner lateral setae <strong>of</strong> leg 1 with spinules<br />
along the basal part <strong>of</strong> the outer edge, prominent,<br />
stout spinules along the outer edges <strong>of</strong> the leg 2<br />
endopod segments, <strong>and</strong> a 2-segmented exopod <strong>of</strong><br />
leg 4. The new species can be separated from the<br />
other 2 species as well as all other species <strong>of</strong> Caligus<br />
found on scombrids by a combination <strong>of</strong> the following<br />
characters: abdomen narrowest anteriorly, widely<br />
divergent tines on the sternal furca, distal process<br />
on the base <strong>of</strong> the second antenna pointed, basipod<br />
<strong>of</strong> leg 1 with a large patch <strong>of</strong> prominent spinules<br />
(fine spinules in C. mutabilis <strong>and</strong> C. bonito), the<br />
spinules on the outer basal margin <strong>of</strong> the lateral setae<br />
<strong>of</strong> leg 1 are finger<strong>like</strong> (short <strong>and</strong> stout in C. mutabilis<br />
<strong>and</strong> C. bonito).<br />
Wilson (1937:27) reported C. mutabilis from<br />
Scomberomorus maculatus (=5. sierra) from Mexico<br />
(Pacific). We suspect that this material was actually<br />
the new species reported here. Causey (1960:329)<br />
reported C. mutabilis from the Gulf <strong>of</strong> California <strong>and</strong><br />
Pacific coast <strong>of</strong> Mexico from several species <strong>of</strong> fishes<br />
including Scomberomorus sierra. It seems <strong>like</strong>ly to us<br />
that at least the specimens from S. sierra were actually<br />
C. omissus <strong>and</strong> some or all <strong>of</strong> those from the nonscombrid<br />
hosts may have been as well.<br />
Caligus omissus was collected from 36 percent (41<br />
<strong>of</strong> 114) <strong>of</strong> the specimens <strong>of</strong> S. sierra <strong>and</strong> 15 percent<br />
(7 <strong>of</strong> 47) <strong>of</strong> the S. concolor examined. This would indicate<br />
that these species may well be the preferred<br />
hosts for this species. Examination <strong>of</strong> collections from<br />
non-scombrid hosts from the Eastern Pacific may well<br />
turn up additional material <strong>of</strong> this new species.<br />
Caligus biseriodentatus Shen, 1957<br />
FIGURES 57-59, 105<br />
Caligus biseriodentatus Shen, 1957:352.<br />
Caligus proboscidatus Heegaard, 1962:161.<br />
Caligus obovatus Heegaard, 1962:166.<br />
Caligus auxisi Pillai, 1963:85.<br />
MATERIAL EXAMINED.—1 $ from the inner surface<br />
<strong>of</strong> the operculum <strong>of</strong> Auxis thazard from Triv<strong>and</strong>rum,<br />
India (a specimen <strong>of</strong> Caligus auxisi donated to the<br />
Smithsonian by Dr. Pillai) ; holotype (AMS P16418)<br />
<strong>of</strong> C. obovatus Heegaard from Scomberomorus<br />
queensl<strong>and</strong>icus from Queensl<strong>and</strong>. Holotype (AMS<br />
PI6420) <strong>of</strong> C. proboscidatus Heegaard from Scomberomorus<br />
queensl<strong>and</strong>icus; from Queensl<strong>and</strong>; 237<br />
immature 9 <strong>and</strong> $ from mouth, gill arches, <strong>and</strong><br />
inner operculum <strong>of</strong> the following hosts <strong>and</strong> localities:<br />
Scomberomorous commerson from northwest Malagasy<br />
Republic, Somalia, Ceylon, East Indies, Philippines,<br />
China; Scomberomorus guttatus from Arabian<br />
Sea, Ceylon, Thail<strong>and</strong>, East Indies (various locali-
30<br />
ties), Hong Kong; Scomberomorus queensl<strong>and</strong>icus<br />
from Onslow (W. Australia), Ambon (Moluccas);<br />
Scomberomorus plurilineatus from Zanzibar.<br />
FEMALE.—Body form as in Figure 57a. Total length<br />
3.15 mm. Greatest width 1.50 mm (measured at<br />
widest part <strong>of</strong> cephalon) ; cephalon comprising about<br />
40 percent <strong>of</strong> total length. Genital segment somewhat<br />
longer than wide (0.90 X 0.75 mm). Abdomen about<br />
twice as long as wide (0.68 X 0.30 mm), 1-segmented;<br />
dorsal surface distal half with a large patch<br />
<strong>of</strong> spinules, ventral surface distal half with groups <strong>of</strong><br />
spinules as in Figure 57b. Caudal rami slightly longer<br />
than wide, each with a seta on middorsal surface <strong>and</strong><br />
6 subterminal to terminal setae.<br />
Space between frontal lunules (254 fun) greater<br />
than diameter <strong>of</strong> lunule (207 /un). First antenna <strong>of</strong><br />
usual type <strong>of</strong> genus except last segment about 4<br />
times longer than wide (177 X 44 /*m). Postantennal<br />
process finger<strong>like</strong>. Second antenna with usual claw,<br />
base with posterior spatulate process. Postoral process<br />
slender. First maxilla represented by 2 short <strong>and</strong> 1<br />
long setae (nearly as long as postoral process). Second<br />
maxilla typical <strong>of</strong> the genus. Maxilliped with stout<br />
recurved claw at tip. Sternal furca (see Figure 57c)<br />
tines nearly parallel <strong>and</strong>, together, wider than base.<br />
Leg 1 (Figure 57d) basipod covered with conspicuous<br />
spinules, a short plumose seta on distal<br />
margin <strong>and</strong> a longer plumose seta at outer corner;<br />
exopod first segment with row <strong>of</strong> tooth<strong>like</strong> spinules<br />
on inner edge, second segment with usual 3 distal<br />
spines, each with inconspicuous fringe <strong>and</strong> no accessory<br />
process, one terminal plumose seta <strong>and</strong> 3 short<br />
lateral setae, each with 2-3 stout spinules on outer<br />
basal border; endopod reduced. Leg 2 <strong>of</strong> usual form<br />
<strong>of</strong> the genus except setae <strong>of</strong> both rami with a row <strong>of</strong><br />
15-20 conspicuous spinules on proximal outer edge<br />
(Figure 57«) followed by usual plumosites; endopod<br />
first segment with group <strong>of</strong> 3—4 stout spinules on outer<br />
distal corner, second segment with a double row <strong>of</strong><br />
stout spinules (7-8 spinules in each) along outer edge<br />
(Figure 57*). Leg 3 similar to other species <strong>of</strong> genus,<br />
heavily sclerotized spine on exopod first segment (Figure<br />
58a) recurved inwardly. Leg 4 (Figure 58&)<br />
basipod with scattered stout spinules on dorsal surface;<br />
exopod first segment with a row <strong>of</strong> spinules on<br />
outer edge <strong>and</strong> outer distal spine, second segment<br />
with 4 spines, distalmost longest <strong>and</strong> each with a<br />
fringe at base, spines measure 159, 118, 106, 94, <strong>and</strong><br />
106 ftm distal to proximal respectively.<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
MALE.—According to Pillai (1963:87) the second<br />
antenna basal segment with a bossed pad opposite tip<br />
<strong>of</strong> claw. The postantennal process (first maxilla <strong>of</strong><br />
Pillai) a long "sickle-shaped" claw. Maxilliped base<br />
with 4 low projections on inner border. Total length<br />
2.70 mm.<br />
IMMATURE FEMALE.—Body form as in Figure 58d.<br />
Total length 2.90 mm (3.00-2.70 mm) based on an<br />
average <strong>of</strong> 5 specimens. Frontal lunules greatest<br />
width (236 fim) less than least space (interlunular<br />
space) between them (265 /*m). First antenna typical<br />
<strong>of</strong> the genus. Second antenna with strong claw <strong>and</strong><br />
pointed posterior process on base. Postantennal process<br />
a short recurved hook. Postoral process a sharply<br />
pointed process, tip not extending beyond tip <strong>of</strong><br />
mouth tube. Second maxilla typical <strong>of</strong> the genus.<br />
Maxilliped (Figure 58
NUMBER 311 31<br />
between it <strong>and</strong> C. biseriodentatus. They are as follows:<br />
space between lunules slightly greater than<br />
diameter <strong>of</strong> either lunule; second antenna with a<br />
posterior process; one <strong>of</strong> the setae <strong>of</strong> the first maxilla<br />
is exceptionally long; base <strong>of</strong> furca is narrower than<br />
spread <strong>of</strong> tines; basipod <strong>of</strong> leg 1 covered with stout<br />
spinules; lateral setae on leg 1 exopod very short;<br />
armature <strong>of</strong> leg 2 endopod the same; leg 4 exopod<br />
2-segmented <strong>and</strong> terminal spines relatively short <strong>and</strong><br />
distalmost spine only slightly longer than adjacent<br />
spine; armature <strong>of</strong> caudal rami simliar. Based on these<br />
common characters we concluded that Caligus auxisi<br />
represents the adult form <strong>of</strong> Caligus biseriodentatus.<br />
We feel that the adult form <strong>of</strong> this species probably<br />
prefers a non-scombrid host—possibly a prey species.<br />
The first author has experienced a similar circumstance<br />
in a species <strong>of</strong> Caligus from the Gulf <strong>of</strong> Mexico<br />
with the immature stages common on one species <strong>of</strong><br />
fish <strong>and</strong> the adults found only on others.<br />
Discussion<br />
The preceding 4 species (C. bonito, C. mutabilis,<br />
C. omissus, <strong>and</strong> C. biseriodentatus) are morphologically<br />
closely related as pointed out below. They show<br />
an interesting distribution <strong>and</strong> host selection. Caligus<br />
bonito, possibly the ancestral form, is circumglobal<br />
in distribution <strong>and</strong> seems to prefer hosts <strong>of</strong> the tribes<br />
Thunnini <strong>and</strong> Sardini, with an infestation rate <strong>of</strong> 17<br />
percent in the 11 species infested. A single collection<br />
was made from Scomberomorus regalis (1 5 1 $ ),<br />
which was probably an adventitious association.<br />
Caligus mutabilis apparently infests several species <strong>of</strong><br />
hosts in the Western Atlantic but, <strong>of</strong> the scombrids<br />
<strong>of</strong> that area, it is found on species <strong>of</strong> Scomberomorus<br />
with a 3 percent infestation rate on the 3 species infested.<br />
A single collection (19) was made from<br />
Scomber japonicus. Caligus omissus apparently is<br />
restricted to the eastern Pacific <strong>and</strong> is a common<br />
parasite on the 2 species <strong>of</strong> Scomberomorus endemic<br />
to that area with a 29 percent infestation rate. We<br />
have not examined non-scombrid hosts <strong>of</strong> that area<br />
but we suspect that, as in C. mutabilis in the western<br />
Atlantic, it occurs on non-scombrid hosts as well. The<br />
scombrid hosts <strong>of</strong> Caligus biseriodentatus are Auxis<br />
species <strong>and</strong> Scomberomorus. The parasite occurs on<br />
Scomberomorus only in its immature stages. The<br />
adults have been collected from Auxis. We believe<br />
that some other host species is preferred for the<br />
adult as the only collection <strong>of</strong> this species in the adult<br />
form was a single collection from Auxis.<br />
These 4 species have the following characters in<br />
common: an elongate, 1-segmented abdomen; second<br />
antenna with a posterior process on the basal segment;<br />
caudal ramus longer than wide; leg 1 basipod with<br />
a prominent patch <strong>of</strong> spinules; leg 1 lateral setae with<br />
stout spinules on the outer basal part; leg 2 endopod<br />
second segment with conspicuous stout spinules on<br />
the outer edge; leg 4 exopod 2-segmented. Other<br />
Caligus species possess some <strong>of</strong> these characters but<br />
none <strong>of</strong> those found on scombrids share as many.<br />
It is interesting to note that 2 <strong>of</strong> these species<br />
(C. mutabilis <strong>and</strong> C. biseriodentatus) apparently<br />
utilize one host species for the immature forms <strong>and</strong><br />
another for the adult. The relationship between<br />
Caligus mutabilis <strong>and</strong> its various hosts is being studied<br />
by the first author as part <strong>of</strong> a study <strong>of</strong> the parasitic<br />
copepods <strong>of</strong> the teleost fishes <strong>of</strong> Charlotte Harbor,<br />
Florida.<br />
No counterpart Caligus has been collected from the<br />
21 specimens <strong>of</strong> the eastern Atlantic endemic, Scomberomorus<br />
tritor (the record <strong>of</strong> Caligus diaphanus<br />
probably represents an accidental infestation because<br />
species <strong>of</strong> Trigla are its usual hosts).<br />
Caligus cybii Bassett-Smith, 1898<br />
FIGURES 60-63, 104<br />
Caligus cybii Bassett-Smith, 1898a: 6.<br />
Caligus brevisoris Shen, 1957:357.<br />
Caligus quinqueabdominalis Heegaard 1962:162.<br />
MATERIAL EXAMINED.—19 collections containing<br />
158 9 <strong>and</strong> 59 $ from the gills <strong>and</strong> gill area <strong>of</strong> the<br />
following hosts <strong>and</strong> localities: Scomberomorus commerson<br />
from Red Sea (Suez), northwest Malagasy<br />
Republic, Andaman Sea, Gulf <strong>of</strong> Thail<strong>and</strong>, Philippines,<br />
Hong Kong: Scomberomorus koreanus from<br />
Bombay, Sumatra, Japan; Scomberomorus species<br />
from New Guinea; Scomberomorus semifasciatus<br />
from the Gulf <strong>of</strong> Carpenteria; Scomberomorus sinensis<br />
from Hong Kong.<br />
FEMALE.—Body form as in Figure 60a. Total length<br />
4.84 mm (4.65-5.25 mm), based on an average <strong>of</strong><br />
7 specimens. Greatest width 1.65 mm. Cephalon<br />
comprises about 40 percent <strong>of</strong> total length. Genital<br />
segment (Figure 606) trapizoidal (widest posteriorly),<br />
somewhat wider than long (1.6 X 1-8 mm), compris-
32<br />
ing about 20 percent total length, posterior corners<br />
not produced. Abdomen (see Figure 60fe) incompletely<br />
divided into 2 segments, widest anteriorly <strong>and</strong><br />
tapering to caudal rami, about 1 x /% times longer than<br />
wide (2.03 X 0.79 mm) comprising about 25 percent<br />
<strong>of</strong> total length. Caudal rami (Figure 60c) small,<br />
somewhat longer than wide (236 X 200 /nm) armed<br />
with plumose setae as in the figure.<br />
Oral area as in Figure 60a". First antenna (Figure<br />
60«) with 27 setae (most plumose) on first segment<br />
<strong>and</strong> 13 naked setae on last segment. Postantennal<br />
spine (Figure 61a) very small. Postoral spine as in<br />
Figure 61c. Second maxilla (Figure 61a 1 ) <strong>of</strong> usual<br />
caligoid type with 2 terminal, fringed, flagella. Maxilliped<br />
(Figure 61 e) a stout claw. Sternal furca (Figure<br />
61/) with divergent tines, not sharply pointed.<br />
Leg 1 (Figure 61g) basipod with a patch <strong>of</strong> fine<br />
spinules, a short plumose seta on posterior border, <strong>and</strong><br />
a long plumose seta on outer distal corner; exopod<br />
first segment with a row <strong>of</strong> long spinules along most<br />
<strong>of</strong> inner edge <strong>and</strong> a short, finely serrate spine on<br />
outer distal corner, last segment with 4, finely serrate,<br />
spines without accessory spines <strong>and</strong> 3 setae on inner<br />
margin (plumosities <strong>of</strong> setae thickened) ; endopod<br />
reduced to a short process with 2 small spines at tip.<br />
Leg 2 (Figure 62a) coxopod with a patch <strong>of</strong> fine<br />
spinules on outer surface; basipod with very short<br />
spine at outer distal corner; exopod first 2 segments<br />
with heavily sclerotized, finely serrate, inwardly<br />
directed spines on outer distal corner, last segment<br />
with 2 short spines <strong>and</strong> a longer terminal spine with<br />
prominent plumosities along inner margin, all segments<br />
with plumose setae in the figure; endopod<br />
second segment with a prominent patch <strong>of</strong> long<br />
spinules on outer edge, last segment with a small patch<br />
<strong>of</strong> similar spinules at outer proximal half, all segments<br />
with plumose setae as in the figure. Leg 3 (Figure<br />
626) typical <strong>of</strong> the genus, outer margin <strong>of</strong> basipod<br />
with heavy spinules; exopod first segment with stout,<br />
inwardly directed spine on outer distal corner, other<br />
2 segments with plumose setae as in figure; endopod<br />
reduced with 3 incompletely separated segments bearing<br />
plumose setae as in figure. Leg 4 (Figure 62c)<br />
exopod 3-segmented; the first 2 each bearing a prominent<br />
spine on outer distal corner, last segment with<br />
3 terminal spines, terminalmost longest, the 5 spines<br />
<strong>of</strong> the exopod measure 171, 124, 142, 142, <strong>and</strong> 200<br />
f*m proximal to distal respectively, each with a conspicuous<br />
fringe at base <strong>and</strong> on edges as figured. Leg<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
5 represented by a pair <strong>of</strong> small plumose setae at<br />
outer posterior corners <strong>of</strong> genital segment.<br />
MALE.—Body form as in Figure 62rf. Total length<br />
3.24 mm (3.00-3.45 mm) based on an average <strong>of</strong> 5<br />
specimens. Genital segment (Figure 63a) somewhat<br />
longer than wide (841 X 739 /xm). Abdomen 2segmented,<br />
somewhat longer than wide (580 X<br />
450 /Am), second segment about 2/2 times length <strong>of</strong><br />
first. Caudal rami as in female.<br />
Cephalic appendages as in female except second<br />
antenna (Figure 636) with rugose areas on basal<br />
segment <strong>and</strong> a bifid claw; postoral process (Figure<br />
63c) with an accessory process <strong>and</strong> spine near distal<br />
two-thirds; maxilliped (Figure 63d) basal segment<br />
with sclerotized processes opposite tip <strong>of</strong> claw, claw<br />
more robust than in female.<br />
Legs as in female except leg 5 represented by 3<br />
short, plumose, setae at each lateral mid-margin <strong>and</strong><br />
leg 6 represented by 3 similar setae at posterior distal<br />
corners <strong>of</strong> genital segment (see Figure 63a).<br />
REMARKS.—So far this species is reported only from<br />
Indo-West Pacific species <strong>of</strong> Scomberomorus. Collection<br />
data indicates this parasite is usually found on the<br />
gills, gill arches, operculum, <strong>and</strong> pseudobranch <strong>of</strong><br />
the host.<br />
Caligus pelamydis Kroyer, 1863<br />
FIGURES 64-66, 104<br />
Caligus pelamydis Kroyer, 1863:124.<br />
Caligus scomberi Bassett-Smith, 1896:11.<br />
Caligus scombri Scott, T., 1901:148.<br />
Parapetalus sp. Silas <strong>and</strong> Ummerkutty, 1967:908.<br />
This species has been recorded many times from<br />
scombrid <strong>and</strong> non-scombrid hosts (see Lewis, 1967:<br />
139). Shiino, 1965 <strong>and</strong> Lewis, 1967 have provided<br />
good descriptions <strong>of</strong> this species. We will discuss only<br />
those features <strong>of</strong> special taxonomic importance in<br />
addition to including figures. A complete synopsis<br />
<strong>of</strong> the literature has been provided by Margolis,<br />
Kabata, <strong>and</strong> Parker, 1975:59.<br />
MATERIAL EXAMINED.—30 collections containing<br />
97 9 <strong>and</strong> 4 $ from the gill arches, gills, <strong>and</strong> inner<br />
wall <strong>of</strong> the operculum <strong>of</strong> the following hosts <strong>and</strong><br />
localities: Scomber scombrus from France; Scomber<br />
japonicus from Gulf <strong>of</strong> Mexico, Florida (Atlantic),<br />
Gulf <strong>of</strong> Guinea; Scomberomorus niphonius from<br />
Japan; Auxis species from New South Wales; Euthynnus<br />
affinis from New South Wales; Euthynnus allet-
NUMBER 311 33<br />
teratus (locality unknown); Sarda sarda from Argentina,<br />
Gulf <strong>of</strong> Guinea, Tunis, South Africa (Port<br />
Elizabeth); Sarda australis from New South Wales;<br />
Sarda chiliensis lineolatus from California.<br />
FEMALE.—Body form as in Figure 64a. Range <strong>of</strong><br />
total length 3.00-^.65 mm. As in other species <strong>of</strong><br />
Caligus with widespread distribution, the size differences<br />
seem to be correlated with water temperature<br />
rather than host species.<br />
Caligus pelamydis females can be separated from<br />
other species <strong>of</strong> Caligus found on scombrids by the<br />
following combination <strong>of</strong> characters: cephalon 40-45<br />
percent <strong>of</strong> total length; abdomen 23-25 percent <strong>of</strong><br />
total length; second <strong>and</strong> third segments <strong>of</strong> leg 2<br />
endopod (see Figure 65«) each with a large patch <strong>of</strong><br />
fine spinules along outer edge; leg 4, 3-segmented<br />
with last segment produced distally to give segment a<br />
triangular shape (see Figure 666) <strong>and</strong> prominent<br />
fringes at bases <strong>of</strong> all setae, tines <strong>of</strong> sternal furca<br />
spatulate <strong>and</strong> as wide or wide than base (Figure<br />
65c).<br />
MALE.—Body form as in Figure 66c. Range <strong>of</strong> total<br />
length 2.48-2.55 mm (based on 3 specimens from<br />
Sarda sarda, Gulf <strong>of</strong> Guinea). Males are generally<br />
rare in collections (comprising only about 4 percent<br />
<strong>of</strong> the total sample studied). Shiino (1965:411),<br />
described the male <strong>of</strong> this species comparing it to an<br />
immature female in the same collection. Certain appendages<br />
differ between the sexes but some <strong>of</strong> those<br />
noted by Shiino were probably due to the immaturity<br />
<strong>of</strong> the female. In our sample we found the following<br />
differences based on adults <strong>of</strong> both sexes: second<br />
antenna <strong>of</strong> male with rugose patch along posterior<br />
edge <strong>of</strong> basal segment; postoral process <strong>of</strong> male (Figure<br />
66
34<br />
with long inwardly directed spine, on outer distal<br />
corner, second segment with somewhat shorter similar<br />
spine, last segment with similar spine about half<br />
length <strong>of</strong> that <strong>of</strong> the first segment, exopod segments<br />
otherwise armed with plumose setae as in the figure;<br />
endopod first segment with a row <strong>of</strong> short spinules<br />
along outer edge <strong>and</strong> a patch <strong>of</strong> longer spinules at<br />
outer distal comer, second segment with a dense patch<br />
<strong>of</strong> long spinules along outer edge, third segment with<br />
a few long spinules at outer proximal edge, endopod<br />
with plumose setae as in the figure. Leg 3 (Figure<br />
69a) exopod first segment with stout, slightly recurved<br />
spine, on outer distal corner, second segment<br />
with short, weak, spine on outer distal corner,<br />
last segment with 3 weak spines <strong>and</strong> 4 plumose setae;<br />
endopod with 2 segments bearing plumose setae as<br />
in the figure. Leg 4 (Figure 696) exopod first segment<br />
outer edge produced as approximate right angle at<br />
distal two-thirds; last segment with distalmost spine<br />
2/2 times length <strong>of</strong> others (442 X 177 /*m). Leg 5<br />
represented by 3 short plumose setae near edge <strong>of</strong><br />
genital segment at distal three-fourths.<br />
MALE.—Body form as in Figure 69
NUMBER 3 1 1 35<br />
corner <strong>and</strong> an inner seta, last segment with 3 outer<br />
spines <strong>and</strong> 5 terminal to inner setae; endopod first<br />
segment with an inner seta, second segment with a<br />
patch <strong>of</strong> long spinules along outer edge <strong>and</strong> 2 inner<br />
setae, last segment with a patch <strong>of</strong> long spinules on<br />
outer edge <strong>and</strong> 6 setae. Third leg (Figure 72a)<br />
basipod with scattered short spinules near outer margin;<br />
exopod first segment with a prominent spine on<br />
outer distal corner, second segment with a short spine<br />
on outer distal corner <strong>and</strong> inner seta, last segment<br />
with 3 short outer spines <strong>and</strong> 4 terminal to inner<br />
setae; endopod first segment with an inner seta, last<br />
segment with 6 terminal setae. Fourth leg (Figure<br />
72b) basipod with a small seta on outer distal corner;<br />
exopod first segment with a fringed seta (112 /Am)<br />
on outer distal corner, second segment with fringed<br />
seta (136 /*m) on outer distal corner, last segment<br />
with 3 fringed setae (153, 165, <strong>and</strong> 206 /*m long<br />
respectively), a fringe at base <strong>of</strong> each seta. Fifth leg<br />
represented by 4 setae near the posterior distal corner<br />
<strong>of</strong> the genital segment.<br />
MALE.—Body form as in Figure 72c. Total length<br />
2.39 mm, greatest width 1.30 mm. Genital segment<br />
about as long as wide (0.43 X 0.45 mm). Abdomen<br />
2-segmented segments measure 88 X 250 fixn <strong>and</strong><br />
292 X 280 jan (length X width) respectively. Caudal<br />
rami as in female. Appendages as in female except<br />
as follows. Second antenna (Figure 72d) with accessory<br />
process on claw <strong>and</strong> bossed areas on segments as<br />
illustrated. Postoral process (Figure 72«) with accessory<br />
process at distal two-thirds. Maxilliped (Figure<br />
72/) base with 2 well-developed processes opposing<br />
tip <strong>of</strong> claw, portion <strong>of</strong> claw distal to seta proportionately<br />
shorter than in female. Fifth leg represented by<br />
4 setae at mid-lateral margin <strong>of</strong> genital segment. Sixth<br />
leg represented by 3 setae at posterior distal corners<br />
<strong>of</strong> genital segment.<br />
REMARKS.—This species has been reported by<br />
numerous authors from the west coasts <strong>of</strong> Europe <strong>and</strong><br />
Africa (see Margolis, et al, 1975). It is apparently<br />
commonly found on species <strong>of</strong> Trigla but has been<br />
reported from several other hosts as well. Our report<br />
here is the first from a scombrid host <strong>and</strong> in light<br />
<strong>of</strong> the many previous literature citations it should not<br />
be considered a primary parasite <strong>of</strong> scombrids. We<br />
have included its description here as no complete<br />
description exists in modern literature. The specimens<br />
studied in this description were compared with ma-<br />
terial collected by us from Trigla lineata from <strong>of</strong>f<br />
Naples, Italy. •<br />
Caligus savala Gnanamuthu, 1948<br />
FIGURE 73a-/<br />
Caligus savala Gnanamuthu, 1948:591.<br />
Caligus affinis Kurian, 1961:71.<br />
Caligus acutus Kirtisinghe, 1964:66.<br />
Gnanamuthu described this species from specimens<br />
collected from the plankton <strong>and</strong> a single male from<br />
the body surface <strong>of</strong> Trichiurus savala Cuvier. Kurian<br />
collected 2 9 from the body surface <strong>of</strong> Euthynntu<br />
affinis (described as C. affinis). Kirtisinghe, 1964,<br />
noted that Caligus affinis was preoccupied <strong>and</strong> renamed<br />
the species Caligus acutus Kirtisinghe. Pillai,<br />
1971:164 redescribed the species from type material<br />
<strong>of</strong> C. savala deposited in the British Museum <strong>and</strong><br />
placed C. affinis <strong>and</strong> C. acutus in synonymy with C.<br />
savala.<br />
The single record <strong>of</strong> this species from a scombrid<br />
indicates that its occurrence on such a host was<br />
probably accidental.<br />
The female may be characterized as follows. Body<br />
form as in Figure 73a. Second antenna (Figure 736)<br />
with pointed posterior process on base. Postantennal<br />
process (Figure 73c) not strongly curved. Sternal<br />
furca (Figure 73a") with tines only slightly divergent<br />
<strong>and</strong> spreading only slightly wider than base. Leg 2<br />
endopod with patches <strong>of</strong> slender spinules along outer<br />
margin <strong>of</strong> each (entire margin <strong>of</strong> segment 1 with<br />
spinules—usually only at outer corner <strong>of</strong> other<br />
species). Stout spine at the outer distal corner <strong>of</strong><br />
leg 3 exopod first segment not curved inwardly. Leg<br />
4 exopod (Figure 73/) 2-segmented, distalmost spine<br />
about one-third longer than adjacent spine.<br />
We did not collect this species <strong>and</strong> have based the<br />
brief description <strong>and</strong> figures on Pillai's redescription<br />
in 1971.<br />
Caligus macarovi Gussev, 1951<br />
FIGURES 73g-i, 74o-6<br />
Caligus macarovi Gussev, 1951:408.<br />
Caligus fulvipurpureus Shiino, 1954:150.<br />
Gussev described this species from specimens collected<br />
from 4 species <strong>of</strong> fish including Auxis <strong>and</strong><br />
Cololabis saira (Brevoort) from the Sea <strong>of</strong> Japan.
36 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Shiino later (1954:150) reported it (as C. fulvipurpureus)<br />
from the body surface <strong>of</strong> several Cololabis<br />
saira from Japan <strong>and</strong> again (Shiino, 1959b:277)<br />
from <strong>of</strong>f Mexico (Pacific) as C. macarovi. This parasite<br />
apparently is common on Pacific Cololabis (also<br />
reported from this host by Kazachenko, et al, 1972:<br />
224). It is not surprising that a copepod common on<br />
a prey species <strong>of</strong> fish (Cololabis) would occasionally<br />
be found on its predator species. The female <strong>of</strong> this<br />
species is characterized by the following. Cephalon<br />
comprises about 40 percent <strong>of</strong> total length (see Figure<br />
73g). Genital segment about as wide as cephalon,<br />
sides nearly parallel. Abdomen one-segmented, about<br />
twice as long as wide. Second antenna with usual<br />
claw, posterior process on basal segment. Postantennal<br />
spine short, angle <strong>of</strong> inner curve greater than 90°<br />
(see Figure 73h). Maxilliped with 2-segmented claw.<br />
Sternal furca (Figure 73*) tines not widely divergent,<br />
not sharply pointed. Leg 1 basipod with patch <strong>of</strong><br />
spinules, 3 inner lateral setae <strong>of</strong> last segment with<br />
spinules on outer basal part followed by fringe. Leg<br />
2 endopod segments (Figure 74a) each with a dense<br />
patch <strong>of</strong> spinules on outer edge. Leg 4 (Figure 74fc)<br />
exopod 2-segmented, last segment without midlateral<br />
spine, distalmost spine longer than adjacent spine.<br />
Male as in female except in body form. Second antenna<br />
with short claw <strong>and</strong> rugose areas on basal<br />
segment. Maxilliped with rugose area on basal segment<br />
opposite tip <strong>of</strong> claw.<br />
We did not collect this parasite during the course<br />
<strong>of</strong> this study. This is undoubtedly due to its rarity on<br />
scombrids <strong>and</strong> its occurrence on the body surface <strong>of</strong><br />
the host (not usually found on preserved hosts).<br />
Caligns amblygenitalis Pill a i, 1961<br />
FIGURE l\c-g<br />
Caligns amblygenitalis Pillai, 1961:98.<br />
Pillai describted this species from a single female<br />
collected from the body surface <strong>of</strong> Euthynnus affinis<br />
from Vizhingom, India. It has not been recorded<br />
since.<br />
The female is distinguished by the following characters.<br />
Frontal lunules widely separated, interlunular<br />
space about 3 times diameter <strong>of</strong> lunule (according to<br />
Pillai's figure). Genital segment about as long as<br />
cephalon <strong>and</strong> with lobed posterior corners. Abdomen<br />
1-segmented, about twice as long as wide. Second<br />
antenna with posterior process on basal segment.<br />
Postantennal process (first maxilla <strong>of</strong> Pillai) long<br />
<strong>and</strong> blunt. Sternal furca with widely divergent tines,<br />
spread <strong>of</strong> tines wider than base. Leg 1 lateral setae<br />
with spinules on basal part <strong>of</strong> outer edge. Leg 2<br />
endopod segments with a patch <strong>of</strong> narrow spinules<br />
on the outer edge <strong>of</strong> each, second spine on exopod<br />
with strong teeth on outer edge. Leg 4 exopod 2segmented,<br />
bearing 4 spines (no lateral spine on last<br />
segment which is usually present in other species when<br />
exopod is 2-segmented), distalmost spine about onethird<br />
longer than adjacent spine.<br />
Caligus pseudokalumai Lewis, 1968<br />
Caligns pseudokalumai Lewis, 1968:59.<br />
This species was described from a single female<br />
collected from the body surface <strong>of</strong> a Gymnosarda<br />
unicolor from Eniwetok Atoll. Lewis compared this<br />
species with a previously described species, Caligus<br />
kalumai Lewis, 1964, collected from Acanthurus<br />
guttatus from Hawaii. The differences between the<br />
2 species are slight <strong>and</strong> Lewis suggested that their<br />
close relationship should be more closely examined<br />
when additional material is available. We feel that<br />
this species represents an accidental infestation <strong>and</strong><br />
Gymnosarda unicolor is not its usual host. Lewis has<br />
provided a good description with illustrations <strong>and</strong><br />
since this is undoubtedly not a scombrid parasite we<br />
will not repeat a description here.<br />
Elytrophora Gerstaecker, 1853<br />
Elytrophora brachyptera Gerstaecker, 1853<br />
FIGURES 75-77, 106<br />
Elytrophora brachyptera Gerstaecker, 1853:58.<br />
Elytrophora hemiptera Wilson, 1921:4.<br />
MATERIAL EXAMINED.—78 collections containing<br />
771 9 269 $ from the gill area <strong>of</strong> the following hosts<br />
<strong>and</strong> localities: Thunnus alalunga from He Amsterdam,<br />
Chile, New Jersey, Brazil (north coast), North<br />
Atlantic (25°N, 35°W), Azores Isl<strong>and</strong>s; T. albacares<br />
from Chagos, Australia (NSW), Christmas Isl<strong>and</strong><br />
(Pacific), Hawaii, New Jersey, Brazil (north coast) ;<br />
T. atlanticus from St. Thomas Isl<strong>and</strong>; T. maccoyii<br />
from Western Australia (Albany) ; T. obesus from<br />
He Amsterdam, Seychelles, Christmas Isl<strong>and</strong> (Pacific),
NUMBER 3 1 1 37<br />
Hawaii, Juan Fern<strong>and</strong>ez Isl<strong>and</strong>s, New Jersey, Brazil<br />
(north coast), Cape Verde Isl<strong>and</strong>s, Canary Isl<strong>and</strong>s,<br />
Azores Isl<strong>and</strong>s; T. thynnus from South Africa (west<br />
coast), Eastern Pacific, Western North Atlantic, New<br />
Jersey, Portugal (Lisbon); Allothunnus fallai from<br />
New Zeal<strong>and</strong>, California.<br />
FEMALE.—Body form as in Figure 75a. Total length<br />
8.26 mm, greatest width 4.71 mm (measured at widest<br />
part <strong>of</strong> cephalon). Genital segment longer than<br />
wide (2.61 X 1-89 mm). Abdomen 2-segmented, segments<br />
measure (1 X w) 0.72 X 0.87 mm, 0.68 X<br />
0.85 mm respectively; first segment partially hidden<br />
in dorsal view by flaps <strong>of</strong> genital segment. Caudal<br />
rami (Figure 756) longer than wide (680 X 400 /*m),<br />
each with 6 setae (2 very small). First antenna (Figure<br />
75c) 2-segmented. Second antenna (Figure 75d)<br />
basal segment with prominent triangular process,<br />
terminal segment claw<strong>like</strong> with 1 short spine <strong>and</strong> 1<br />
seta. Mouthtube, m<strong>and</strong>ible, post oral process <strong>and</strong> first<br />
maxilla as in Figure 75e; m<strong>and</strong>ible with 12 teeth;<br />
post oral process about as long as mouthtube; first<br />
maxilla with 3 small setae. Second maxilla (Figure<br />
75/) terminal segment with 2 prominent pectinated<br />
membranes at about mid-point, terminally with 2<br />
long curved, subequal fringed processes. Maxilliped<br />
(Figure 75g) claw distal half finely grooved. Sternal<br />
furca (Figure 76a) with stout, widely divergent tines.<br />
Leg 1 (Figure 76b) biramous, endopod first segment<br />
without ornamentation, second segment spinulose<br />
along outer edge, 3 inner setae; exopod onesegmented<br />
with 3 stout, fringed outer spines, 1<br />
terminal plumose seta, 3 inner plumose setae. Leg 2<br />
(Figure 76c) biramous, rami 3-segmented, endopod<br />
first <strong>and</strong> second segments each with spinulose outer<br />
edges, third segment small, with 6 setae; exopod with<br />
4 outer spinulose spines, last segment with 6 setae. Leg<br />
3 (Figure 76d) endopod first segment with inner<br />
seta, second segment with 2 inner setae, third segment<br />
small, with 4 setae; exopod as in Figure 77a. Leg 4<br />
(Figure 77b) endopod 2-segmented, first segment<br />
with inner seta, second segment incompletely divided<br />
with one short inner seta <strong>and</strong> 3 short terminal setae;<br />
exopod first segment with outer spinulose spine,<br />
second segment similar, with inner seta, third segment<br />
with 3 outer to terminal spines <strong>and</strong> 4 short inner<br />
setae. Legs 5 <strong>and</strong> 6 represented by 1 <strong>and</strong> 3 setae<br />
respectively on lateral genital segment.<br />
MALE.—Body form as in Figure 77d\ Total length<br />
6.67 mm, greatest width 3.62 mm (measured at widest<br />
part <strong>of</strong> cephalon). Genital segment (Figure 77«)<br />
longer than wide (1.74 X 1.53 mm). Abdomen 2segmented,<br />
segments measure (1 X w) 0.56 X 0.72<br />
mm, 0.52 X 0.69 mm respectively. Caudal rami similar<br />
to female. First antenna 2-segmented, similar to<br />
female. Second antenna (Figure 77/) terminal segment<br />
long, recurved claw with stout spine on inner<br />
margin; triangular process on basal segment not as<br />
prominent as in female. Remaining cephalic appendages<br />
except maxilliped similar to female. Maxilliped<br />
modified as in Figure 77g. Sternal furca slender, tines<br />
less divergent than in female. Legs 1-6 similar to<br />
female, except leg 4 endopod setae longer.<br />
REMARKS.—Examination <strong>of</strong> Wilson's types <strong>of</strong> E.<br />
hemiptera indicate that they are actually E. brachyptera<br />
<strong>and</strong> we have placed his species in synonomy.<br />
Hewitt (1968) made a tentative revision <strong>of</strong> the genus<br />
Elytrophora in which he considered E. brachyptera<br />
to be the only species with 2 additional subspecies<br />
{atlantica <strong>and</strong> indica). We feel that E. indica is a<br />
valid species <strong>and</strong> have indicated it as such below.<br />
Elytrophora brachyptera is a circumglobal species<br />
found on several species <strong>of</strong> Thunnini.<br />
We noticed that material collected from colder<br />
waters (New Zeal<strong>and</strong> <strong>and</strong> lie Amsterdam) show a<br />
variation in the armature <strong>of</strong> leg 4. One <strong>of</strong> the 4 inner<br />
setae is strongly developed whereas in specimens from<br />
more temperate waters all <strong>of</strong> these setae are reduced<br />
(compare Figures 77& <strong>and</strong> c). We did not feel this<br />
variation warranted designating the colder water<br />
material as a new species. These variant specimens<br />
were collected from the lie Amsterdam specimen <strong>of</strong><br />
Thunnus obesus <strong>and</strong> the southernmost specimens <strong>of</strong><br />
Allothunnus.<br />
Elytrophora indica Shiino, 1958<br />
FIGURES 78, 79a,b, 106<br />
Elytrophora indica Shiino, 1958:107.<br />
Elytrophora brachyptera indica Shiino.—Hewitt, 1968:124.<br />
MATERIAL EXAMINED.—9 collections containing<br />
128 $ 27 $ from the gill area <strong>of</strong> Thunnus obesus from<br />
He Amsterdam, Seychelles, Christmas Isl<strong>and</strong> (Pacific),<br />
Juan Fern<strong>and</strong>ez Isl<strong>and</strong>s.<br />
FEMALE.—Body form as in Figure 78a. Total<br />
length 10.15 mm, greatest width 5.80 mm (measured<br />
at widest part <strong>of</strong> cephalon). Genital segment (Figure<br />
78fc) longer than wide (2.97 X 2.20 mm). Abdomen
38<br />
(see Figure 786) first segment crescent-shaped, produced<br />
at posterior corners to envelope anterior half<br />
<strong>of</strong> second segment; segments measure (1 X w) 1.01 X<br />
1.50 mm, 1.02 X 1.10 mm respectively. Caudal rami<br />
longer than wide (0.65 X 0-43 mm) similar to E.<br />
brachyptera. First antenna (Figure 78
NUMBER 311 39<br />
a partially dissected male was in the vial when we<br />
received it from the Australian Museum. Examination<br />
<strong>of</strong> this specimen <strong>and</strong> Heegaard's figures <strong>of</strong> the<br />
female lead us to believe that this species was erroneously<br />
placed in the Euryphoridae by the author.<br />
His basis for doing so was the presence <strong>of</strong> dorsal<br />
plates covering the fourth thoracic segment. His figures<br />
do not indicate these <strong>and</strong> the male specimen does<br />
not have them. Unfortunately, lacking the female, we<br />
could not resolve the problem <strong>of</strong> its true taxonomic<br />
position. We hope that additional material <strong>of</strong> this<br />
interesting species will be collected eventually <strong>and</strong> its<br />
taxonomic position made clear.<br />
We have refigured the male maxilliped (Figure<br />
80c), sternal furca (Figure SOd), leg 1 (Figure 80*),<br />
<strong>and</strong> leg 2 (Figure 80f).<br />
The original collection was made from the body<br />
surface <strong>of</strong> Euthynnus affinis (reported as E. alletteratus)<br />
from Howick Isl<strong>and</strong>, north Queensl<strong>and</strong>,<br />
Australia.<br />
The total length <strong>of</strong> the male is 3.35 mm.<br />
Tuxophorus Wilson, 1908<br />
Tuxophorus cybii Nunes-Ruivo <strong>and</strong> Founnanoir,<br />
1956<br />
FIGURE 81a<br />
Tuxophorus cybii Nunes-Ruivo <strong>and</strong> Fourmanoir, 1956:76.<br />
Tuxophorus sol<strong>and</strong>ri Kurian, 1961:72.<br />
We did not collect this species but we have reproduced<br />
the figure <strong>of</strong> the female based on the illustration<br />
<strong>of</strong> Nunes-Ruivo <strong>and</strong> Fourmanoir. In 1961 Kurian<br />
described a new species, T. sol<strong>and</strong>ri, based on a single<br />
specimen from the body surface <strong>of</strong> Acanthocybium<br />
sol<strong>and</strong>ri from India. Kurian was apparently unaware<br />
<strong>of</strong> the description <strong>of</strong> T. cybii earlier as he made no<br />
mention <strong>of</strong> it. Comparisons <strong>of</strong> the 2 descriptions leave<br />
no doubt that they represent the same species <strong>and</strong>,<br />
consequently, we have placed Kurian's T. sol<strong>and</strong>ri<br />
in synonymy with T. cybii.<br />
Furthermore, we suspect that T. cervicornis <strong>of</strong> Heegaard<br />
(described below) may also be a synonym <strong>of</strong><br />
T. cybii. The only difference we find between Heegaard's<br />
species <strong>and</strong> T. cybii <strong>and</strong> T. sol<strong>and</strong>ri is the<br />
highly developed processes on the outer distal corners<br />
<strong>of</strong> T. cervicornis (absent in the other 2). This could<br />
be accounted for if the descriptions <strong>of</strong> T. cybii <strong>and</strong><br />
T. sol<strong>and</strong>ri are based on immature specimens. Each<br />
description is based on a single specimen <strong>and</strong> neither<br />
Nunes-Ruivo <strong>and</strong> Fourmanior or Kurian show egg<br />
strings in the illustrations (Heegaard does).<br />
One <strong>of</strong> our collections <strong>of</strong> T. cervicornis is from<br />
Pakistan, extending the range <strong>of</strong> that species to within<br />
the known range <strong>of</strong> T. cybii.<br />
Since we did not collect specimens <strong>of</strong> T. cybii or<br />
immature T. cervicornis we feel it would be premature<br />
to place T. cybii in synonymy. We trust that future<br />
collection will bear out our suspicions regarding the<br />
synonymy <strong>of</strong> these 2 species.<br />
Tuxophorus cervicornis Heegaard, 1962<br />
FIGURE 81 b-g<br />
Tuxophorus cervicornis Heegaard, 1962:172.<br />
MATERIAL EXAMINED.—2 collections containing 2 9<br />
from the body surface <strong>of</strong> Scomberomorus commerson<br />
from C<strong>of</strong>fs Harbor, New South Wales, Australia, <strong>and</strong><br />
Karachi, Pakistan.<br />
FEMALE.—Body form as in Figure 81fe. Total length<br />
6.80 mm. Greatest width 3.15 mm. Cephalon slightly<br />
longer than wide (3.10 X 3.15 mm). Thoracic segment<br />
bearing leg 4 with dorso-lateral wing<strong>like</strong> plates.<br />
Genital segment slightly wider than long (2.10 X 2.25<br />
mm, including posterior processes) ; outer posterior<br />
corners produced. Abdomen 3-segmented. Caudal<br />
ramus about 6.5 times longer than wide (1.95 X 0.30<br />
mm). Oral appendages as in T. collettei except sternal<br />
furca with pointed tines (Figure 81tf) rather than<br />
spatulate. Leg 1 as in T. collettei except spinules on<br />
terminal spines thicker in T. cervicornis. Legs 2-3<br />
as in T. collettei. Leg 4 (Figure 81g) exopod 3-segmented,<br />
terminalmost spine shorter (relative to adjacent<br />
spine) than in T. collettei.<br />
MALE.—Unknown.<br />
REMARKS.—This species has been reported from<br />
Scomberomorus commerson from northern Australia<br />
<strong>and</strong> Pakistan. See the discussion following the description<br />
<strong>of</strong> T. cybii for comparisons with that species.<br />
Tuxophorus collettei, new species<br />
FIGURES 82-84<br />
MATERIAL EX MINED.—Holotype $ (USNM<br />
172250), allotype (USNM 172251), <strong>and</strong> 13 $ 1 $
40 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
paratypes (USNM 172252 collected from the body<br />
surface <strong>of</strong> Scomberomorus regalis caught <strong>of</strong>f the Virgin<br />
Isl<strong>and</strong>s, 8 June 1967 during a cruise <strong>of</strong> the R.V.<br />
Oregon II. Collected by C. A. Child.<br />
FEMALE.—Body form as in Figure 82a. Total length<br />
(including caudal rami) 9.0 mm, greatest width<br />
(measured at widest part <strong>of</strong> cephalon) 2.33 mm.<br />
Cephalon somewhat longer than wide (2.55 X 2.33<br />
mm). Thoracic segments bearing legs 1-3 fused, incorporated<br />
within posterior lateral lobes <strong>of</strong> cephalon.<br />
Thoracic segment bearing leg 4 with lateral wing<strong>like</strong><br />
plates, posterior margins <strong>of</strong> plates reaching to "shoulders"<br />
<strong>of</strong> genital segment. Genital segment longer than<br />
wide (1.58 X 1-35 mm) with lateral margins parallel<br />
giving segment a box<strong>like</strong> shape; distal corners rounded<br />
<strong>and</strong> slightly produced, ventral surface with 2 lateral<br />
patches <strong>of</strong> stout spinules (Figure 82b) ; a dorsal,<br />
heavily sclerotized process near each distal corner<br />
(Figure 82a). Abdomen about 6 times longer than<br />
wide (3.45 X 0-58 mm) narrowing near mid-margin<br />
<strong>and</strong> near distal end. Caudal rami about 3.8 times<br />
longer than wide (490 X 129 fim), widest proximally;<br />
2 short setae on each lateral margin at distal twothirds,<br />
1 subterminal inner seta, 3 short, plumose,<br />
terminal setae.<br />
First antenna (Figure 82*/) 2-segmented; first segment<br />
with 13 short, stout, plumose setae, second segment<br />
with 11 naked setae. Second antenna (Figure<br />
82tf) robust with stout recurved claw, claw with short<br />
seta near base <strong>of</strong> longer seta near middle <strong>of</strong> outer<br />
edge. M<strong>and</strong>ible <strong>of</strong> usual caligoid type with 12 teeth<br />
at tip. First maxilla represented by 3 short setae<br />
lateral to mouthtube near base <strong>of</strong> post-oral process.<br />
Second maxilla (Figure 83a) long <strong>and</strong> slender, a patch<br />
<strong>of</strong> long hairs (compound setae?) at junction <strong>of</strong> first<br />
<strong>and</strong> second segment, a palmate fringe near midmargin<br />
<strong>of</strong> second segment; 2 terminal fringed flagella,<br />
outermost about twice length <strong>of</strong> inner. Maxilliped<br />
(Figure 83b) basal segment with a short, stout seta<br />
near inner mid-margin; second segment in form <strong>of</strong> a<br />
recurved claw bearing a short seta near middle. Sternal<br />
furca (Figure 83c) with short, divergent, truncate<br />
tines, tines with lateral flanges on basal half; accessory<br />
processes lateral to furca.<br />
Legs 1-3 biramose. Leg 1 (Figure 83d) basipod<br />
with posterior seta <strong>and</strong> plumose seta on outer distal<br />
corner; exopod first segment with row <strong>of</strong> hairs along<br />
posterior border <strong>and</strong> short spine on outer distal corner;<br />
second segment with 3 terminal spines, outermost with<br />
inner row <strong>of</strong> spinules, others bifid <strong>and</strong> with broad<br />
serrations on inner <strong>and</strong> outer edges, each spine with<br />
a fringe near its base, a short terminal seta <strong>and</strong> 3<br />
lateral plumose setae: endopod a small process near<br />
base <strong>of</strong> exopod bearing a row <strong>of</strong> hairs near tip. Leg<br />
2 (Figure 83e) basipod unarmed except a prominent<br />
fringe on both inner <strong>and</strong> outer margins; exopod 3segmented,<br />
first segment with a stout serrate spine,<br />
inwardly directed, on outer distal corner <strong>and</strong> an inner<br />
seta, second segment armed as first except spine smaller<br />
<strong>and</strong> more finely serrate, third segment with 2 outer<br />
spines (terminalmost finely fringe) <strong>and</strong> 6 plumose<br />
setae; endopod first segment outer edge with a row<br />
<strong>of</strong> long spinules <strong>and</strong> an inner seta, second segment<br />
with 2 inner setae <strong>and</strong> spinules on outer margins<br />
(smaller than those on first segment), third segment<br />
with spinules on outer edge <strong>and</strong> 6 plumose setae.<br />
Third leg (Figure 84a) basipod with patch <strong>of</strong> spinules<br />
on outer half <strong>and</strong> smaller patch <strong>of</strong> finer spinules<br />
near inner margin; exopod first segment with stout<br />
spine on outer distal corner <strong>and</strong> fringe on outer<br />
margin, second segment with spine on outer distal<br />
corner, inner seta, <strong>and</strong> patch <strong>of</strong> long spinules on outer<br />
edge, last segment with 3 outer spines, 4 short terminal<br />
to inner setae, <strong>and</strong> long spinules on outer edge;<br />
endopod first segment with patch <strong>of</strong> spinules along<br />
outer edge <strong>and</strong> inner seta, second segment with patch<br />
<strong>of</strong> spinules on outer edge <strong>and</strong> 6 plumose setae. Leg 4<br />
(Figure 84b) basipod unarmed; exopod 3 segmented,<br />
first <strong>and</strong> second segments each with a fringed spine<br />
on outer distal corner, last segment with 3 fringed<br />
spines measuring 82, 112, <strong>and</strong> 236 fim respectively,<br />
each exopod spine with a fringe near its base. No<br />
evidence <strong>of</strong> legs 5 or 6 could be found.<br />
Egg strings <strong>of</strong> usual caligoid type, reaching well<br />
beyond tip <strong>of</strong> abdomen.<br />
MALE.—Body form as in Figure 84c. Total length<br />
(including caudal rami) 6.15 mm, greatest width<br />
(measured at widest part <strong>of</strong> cephalon) 2.68 mm.<br />
Cephalon about as wide as long (2.68 X 2.33 mm).<br />
General morphology <strong>of</strong> cephalon as in female. Genital<br />
segment (Figure 84a 1 ) longer than wide (1.3 X 0.9<br />
mm), ventral surface with spinules as indicated in<br />
figure. Abdomen similar to that <strong>of</strong> female except only<br />
3.7 times as long as wide (2.68 X 0.73 mm), small<br />
spinules on ventral surface. Caudal rami as in female<br />
(590 X 141 fim). Cephalic appendages as in female<br />
except second antenna (Figure 84e) with large rugose<br />
areas on basal segments <strong>and</strong> maxilliped with
NUMBER 3 1 1 41<br />
small rugose knob on basal segment opposing tip <strong>of</strong><br />
claw.<br />
Legs 1-4 as in female. Legs 5 <strong>and</strong> 6 absent.<br />
REMARKS.—Of the 5 previously described species<br />
(not including T. tylosuri, which was replaced in the<br />
genus Caligus by Pillai, 1961) the new species can<br />
be separated from T. wilsoni Kirtisinghe <strong>and</strong> T.<br />
caligodes Wilson by the long, slender caudal ramus<br />
<strong>of</strong> the new species (nearly square in T. wilsoni <strong>and</strong><br />
T. caligodes). It can be separated from T. cybii Nunes-<br />
Ruivo <strong>and</strong> Fourmanoir, T. sol<strong>and</strong>ri Kurian (synonymous<br />
with T. cybii), <strong>and</strong> T. cervicornis Heegaard by<br />
the much longer abdomen, the spatulate tines <strong>of</strong> the<br />
sternal furca, <strong>and</strong> the relatively longer inner seta on<br />
the end <strong>of</strong> leg 4 (twice as long as other leg 4 setae)<br />
<strong>of</strong> T. collettei.<br />
ETYMOLOGY.—This species is named for Dr. Bruce<br />
Collette whose enthusiastic support <strong>and</strong> collecting<br />
efforts made this paper considerably more comprehensive<br />
than it would have been otherwise.<br />
Pseudocycnus Heller, 1868<br />
Pseudocycnus appendiculatus Heller, 1868<br />
FIGURES 85-87, 131-136a<br />
Pseudocycnus appendiculatus Heller, 1868:218.<br />
Pseudocycnus spinosus Pearse, 1952:30.<br />
Pseudocycnus thynnus Br<strong>and</strong>es, 1955:190.<br />
MATERIAL EXAMINED.—43 collections containing<br />
85 9 4 $ from the gills <strong>of</strong> the following hosts <strong>and</strong><br />
localities: Thunnus tonggol from Pakistan, Gulf <strong>of</strong><br />
Thail<strong>and</strong>; T. albacares from Seychelles Isl<strong>and</strong>, Somalia,<br />
Australia (Queensl<strong>and</strong>), Philippines, Caroline<br />
Isl<strong>and</strong>s, Kapingamarangi Atoll, Peru, Costa Rica<br />
(Pacific), Juan Fern<strong>and</strong>ez Isl<strong>and</strong>s, Gulf <strong>of</strong> Guinea;<br />
T. obesus from Juan Fern<strong>and</strong>ez Isl<strong>and</strong>s, North Atlantic<br />
(40°N, 49°W); Katsuwonus pelamis from<br />
Malagasy Republic, Surinam, Gulf <strong>of</strong> Guinea; Euthynnus<br />
alletteratus from Florida (West Coast), Gulf<br />
<strong>of</strong> Mexico; E. affinis from Malagasy Republic, Gulf<br />
<strong>of</strong> Thail<strong>and</strong>.<br />
FEMALE.—Body form as in Figure 85a. Thoracic<br />
segments bearing legs 2 <strong>and</strong> 3 free, without lateral<br />
processes. Abdomen short, incompletely separated from<br />
genital segment. Caudal rami long, about one-half<br />
length <strong>of</strong> genital segment, fused with abdomen. First<br />
antenna (Figure 85b) 7-segmented; first segment<br />
without setae; second segment with 4 setae, outer distalmost<br />
stout (not as prominent as in Pseudocycnoides),<br />
other segments with setae as in the figure.<br />
Second antenna (Figure 85c) with heavily sclerotized<br />
claw, 2 short, stout setae on inner margin. Mouthtube<br />
(Figure 85d) without ornamentation on labrum. M<strong>and</strong>ible<br />
(Figure 85d) with 7 teeth at tip. First maxilla<br />
(Figure 85«) with 2 stout <strong>and</strong> 1 weak setae at tip.<br />
Second maxilla (Figure 85/) with irregular rows <strong>of</strong><br />
stout spinules along outer edge <strong>of</strong> distal 2 segments.<br />
Maxilliped (Figure 86a) with wide basal articulation,<br />
basal segment narrows proximally to articulate with<br />
claw; claw with bifid tip <strong>and</strong> stout accessory process<br />
near mid-margin.<br />
Leg 1 (Figure 86b) biramous; basipod with 2 patches<br />
<strong>of</strong> long spinules; exopod 1-segmented, bearing 3<br />
short, stout spines at tip; endopod mostly obscured<br />
by fleshy tissue<strong>like</strong> processes from basipod, bearing<br />
2 spines <strong>and</strong> 2 setae at tip. Leg 2 (Figure 86c) basipod<br />
with 3 patches <strong>of</strong> spinules <strong>and</strong> well-developed seta<br />
at outer distal corner; exopod with 4 stout spines<br />
at tip <strong>and</strong> 3 spinules along outer <strong>and</strong> distal margins;<br />
endopod with 3 stout, terminal spines, 2 groups <strong>of</strong><br />
spinules as figured; both rami 1-segmented. Leg 3<br />
(Figure 86d) basipod with a large patch <strong>of</strong> spinules;<br />
exopod fused with basipod <strong>and</strong> bearing 3 spines at tip.<br />
Leg 4 represented by a single lateral seta at proximal<br />
part <strong>of</strong> genital segment. Egg strings long.<br />
MALE.—Body form as in Figure 87a. Total length<br />
2.70 mm. Greatest width 0.75 mm. Genital segment<br />
less than half total body length (520 X 370 /xm<br />
length by width). Abdomen (Figure 87b) longer than<br />
wide (300 X 220 fim). Caudal rami (see Figure 81b)<br />
somewhat longer than abdomen <strong>and</strong> about 4 times<br />
as long as wide (450 X HO [tin) ventral surface with<br />
5 patches <strong>of</strong> sclerotized knobs.<br />
First antenna (Figure 87c) 6-segmented (fourth<br />
segment <strong>of</strong> male is fused fourth <strong>and</strong> fifth segments<br />
<strong>of</strong> female), segment with bulbous spine on outer distal<br />
corner, remaining segments with setae as in the figure.<br />
Maxilliped (Figure 87d) base with patches <strong>of</strong> short<br />
spinules on inner margin <strong>and</strong> a heavily sclerotized<br />
claw, a short seta at outer distal corner <strong>of</strong> penultimate<br />
segment. Other cephalic appendages as in female except<br />
first maxilla with 1 less seta <strong>and</strong> second maxilla<br />
with more spinules at tip.<br />
Leg 1 (Figure 81 e) basipod with 2 patches <strong>of</strong> stout<br />
spinules, a seta at outer distal corner, a prominent,<br />
heavily sclerotized process arising from inner mid-
42 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
margin, process extends to tip <strong>of</strong> exopod; exopod with<br />
1 spine at tip <strong>and</strong> surface ornamentation as in the<br />
figure; endopod an elongate process modified at tip<br />
giving it a tube<strong>like</strong> appearance (see SEM photo). Leg<br />
4 (Figure 87/) a prominent lateral process with a<br />
single seta at tip. Other legs as in the female.<br />
REMARKS.—This species has been recorded many<br />
times from scombrids <strong>and</strong> is apparently circumglobal<br />
in distribution. Kabata (1970:171) summarized the<br />
known hosts <strong>and</strong> distribution to that time.<br />
Our collection indicates that this parasite is most<br />
common on scombrids <strong>of</strong> the tribe Thunnini <strong>and</strong> to a<br />
lesser extent Sardini. The 6 species <strong>of</strong> Thunnini infested<br />
were parasitized at a rate <strong>of</strong> nearly 10 percent<br />
<strong>and</strong> the single species <strong>of</strong> Sardini about 2 percent.<br />
Females <strong>of</strong> this species show considerable variation<br />
in total length. Lewis, et al. (1969) have presented<br />
data based on hosts <strong>and</strong> locality. Total lengths range<br />
from 11-18 mm with the longer specimens from<br />
colder waters.<br />
Pseudocycnoid.es Yamaguti, 1963<br />
Pseudocycnoides armatus (Bassett-Smith, 1898)<br />
FIGURES 88-91a-fe, 107, 1366-/, 137<br />
Hellaria armata Bassett-Smith, 1898a: 10.<br />
Cybicola armata.—Bassett-Smith, 1898b:371<br />
Pseudocycnus armatus.—Kirtisinghe, 1935:339.<br />
Paracycnus lobosus Heegaard, 1962:182.<br />
Pseudocycnoides armatus.—Yamaguti, 1963:172.<br />
Pseudocycnoides rugosa Kensley <strong>and</strong> Grindley, 1973:104.<br />
MATERIAL EXAMINED.—31 collections containing<br />
149 5 11
NUMBER 3 1 1 43<br />
Leg 1 (Figure 90*) biramous, each ramus 1-segmented<br />
<strong>and</strong> not distinctly separate from basipod;<br />
basipod with patch <strong>of</strong> slender spinules, triangular<br />
process, <strong>and</strong> several lobate processes; exopod with<br />
dense outer patch <strong>of</strong> spinules, smaller spinules in semicircle<br />
<strong>and</strong> 2 medial lobes, 2 spines <strong>and</strong> 3 lobed<br />
processes distally; endopod produced as a slender,<br />
elongate, heavily sclerotized spine with several small<br />
distal processes, spine with membrane<strong>like</strong> covering.<br />
Leg 2 (Figure 91a) biramous, each ramus 1-segmented;<br />
basipod with dense inner patch <strong>of</strong> spinules,<br />
2 lighter patches <strong>of</strong> spinules <strong>and</strong> long, slender outer<br />
spine; exopod with irregular distal row <strong>of</strong> short<br />
spinules, 4 terminal spines, outermost spine enlarged,<br />
toothed along outer edge, row <strong>of</strong> hairs near bases <strong>of</strong><br />
3 smaller, inner spines; endopod with irregular patches<br />
<strong>of</strong> spinules, 1-2 rows <strong>of</strong> hairs at bases <strong>of</strong> 3 terminal<br />
spines, innermost spine elongate, densely spinulose<br />
around entire distal three-fourths, tapering gradually.<br />
Leg 3 (Figure 916) similar to female. Legs 4 <strong>and</strong> 5<br />
represented by simple spines on lateral genital segment.<br />
REMARKS.—This species is common on species <strong>of</strong><br />
Scomberomorus throughout the Indo-West Pacific<br />
(except S. niphonius). We examined the type material<br />
<strong>of</strong> P. rugosa Kensley <strong>and</strong> Grindley <strong>and</strong> concluded that<br />
their material was actually P. armatus. Their conclusion<br />
that P. rugosa represented a new species was<br />
based on comparisons with poor literature descriptions<br />
<strong>of</strong> P. armatus (B. Kensley, pers. comm.). We place<br />
P. rugosa in synonymy with P. armatus.<br />
Pseudocycnoides scomberotnori (Yamaguti, 1939)<br />
FIGURES 91 c-g<br />
Pseudocycnus scomberomori Yamaguti, 1939:457.<br />
Pseudocycnoides scomberomori.—Yamaguti, 1963:172.<br />
MATERIAL EXAMINED.—7 collections containing 22 9<br />
from the gills <strong>of</strong> Scomberomorus niphonius from<br />
Korea, North China, Japan.<br />
FEMALE.—Body form as in Figure 9It. Total length<br />
4.8 mm. Greatest width 0.9 mm. Abdomen <strong>and</strong> caudal<br />
rami <strong>of</strong> about equal length (0.6 mm) ; abdomen much<br />
shorter in P. armatus. Appendages as in P. armatus<br />
except as described below. Maxilliped (Figure 91 d)<br />
claw longer <strong>and</strong> tip more recurved. Leg 1 (Figure 9\e)<br />
basipod with large patch <strong>of</strong> spinules (spinules on outer<br />
edge only in P. armatus). Leg 2 (Figure 91/) endopod<br />
longest spine extending beyond tip <strong>of</strong> exopod spines<br />
<strong>and</strong> heavily spinulose (longest spine on endopod <strong>of</strong><br />
P. armatus much shorter <strong>and</strong> with few spinules). Leg<br />
3 (Figure 91 g) outer spine not as robust as in P.<br />
armata.<br />
MALE.—Unknown.<br />
REMARKS.—This species is apparently restricted to<br />
Scomberomorus niphonius, which is endemic to waters<br />
<strong>of</strong> North China <strong>and</strong> Japan. Yamaguti described this<br />
parasite from S. chinensis (probably S. niphonius)<br />
from the Inl<strong>and</strong> Sea <strong>of</strong> Japan.<br />
Pseudocycnoides scomberomori is closely related to<br />
P. armatus but easily separated from it by the characters<br />
cited above.<br />
Pseudocycnoides buccata (Wilson, 1922),<br />
new combination<br />
FIGURES 92-94a-c, 107, 138, 139<br />
Pseudocycnus buccata Wilson, 1922:79.<br />
Cybicola elongate Pearse, 1951:365.<br />
Pseudocycnopsis buccata (Wilson).—Yamaguti, 1963:172.<br />
MATERIAL EXAMINED.—125 collections containing<br />
667 5 10
44 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
bearing 2 short terminal setae. Entire body covered<br />
with dense, fine hairs. First antenna (Figure 92c)<br />
7-segmented, no ornamentation on first segment, remaining<br />
segments with short, naked setae as indicated<br />
in the figure. Second antenna (Figure 92d) a simple<br />
claw with 2 short, stout setae on inner edge <strong>of</strong> claw.<br />
Mouth tube (Figure 92e) without surface ornamentation.<br />
M<strong>and</strong>ible with 6-7 teeth. First maxilla (Figure<br />
92/) bearing 3 setae at tip. Second maxilla (Figure<br />
92g) similar to that <strong>of</strong> P. armatus except no patch<br />
<strong>of</strong> spinules on basal segment. Maxilliped (Figure<br />
93a) with a short, heavily sclerotized claw (Figure<br />
93b), basal segment with a thumb<strong>like</strong> process at inner<br />
proximal corner as in P. armatus.<br />
Legs 1-3 rudimentary. Leg 1 (Figure 93c) rami<br />
1-segmented; exopod with 5 short terminal spines;<br />
endopod bearing a short terminal spine; both rami<br />
covered with dense hairs <strong>and</strong> difficult to study. Leg 2<br />
(Figure 93c) rami 1-segmented; basipod with a welldeveloped<br />
seta at outer distal corner; exopod bearing<br />
4 terminal spines; endopod with 1 easily visible spine,<br />
2 very short spines, <strong>and</strong> spinules as in the figure. Leg 3<br />
(Figure 93c) reduced to a short knob bearing a short<br />
spine. Leg 4 represented by a lateral seta on anterior<br />
genital segment.<br />
Egg string long.<br />
MALE.—Body form as in Figure 93d. Total length<br />
1.88 mm. Greatest width 0.55 mm. Thoracic segments<br />
bearing legs 2 <strong>and</strong> 3 incompletely separated. Genital<br />
segment about twice as long as wide (1.04 X 0.53<br />
mm) ; abdomen (Figure 93e) nearly twice as wide as<br />
long (259 X 147 /xm) with a ventral patch <strong>of</strong> spinules<br />
near each outer distal corner. Caudal rami (see Figure<br />
93e) about twice as long as wide (123 X 64 fim),<br />
bearing 2 prominent lateral setae, 2 small lateral setae<br />
<strong>and</strong> a terminal spine, ventral surface covered with<br />
spinules. First antenna as in female. Second antenna<br />
(Figure 93/) similar to female except claw longer <strong>and</strong><br />
more pointed. Mouth tube (Figure 94a) with 3<br />
patches <strong>of</strong> spinules on lab rum. First maxilla (Figure<br />
94a) with 2 stout setae at tip, setae relatively longer<br />
than in female. Second maxilla as in S. armatus except<br />
no spinules on basal segment. Maxilliped (Figure 94fc)<br />
with 2-segmented claw <strong>and</strong> spinules on proximal inner<br />
corner <strong>of</strong> base.<br />
Leg 1 (Figure 94c) biramous, each ramus 1-segmented<br />
<strong>and</strong> not distinctly articulated with basipod;<br />
basipod with a patch <strong>of</strong> spinules <strong>and</strong> a triangular<br />
process <strong>and</strong> a seta at outer distal corner; exopod with<br />
patches <strong>of</strong> spinules <strong>and</strong> spinulose lobes in distal third,<br />
2 short spines at tip; endopod modified as a curved,<br />
heavily sclerotized process, lobed at tip <strong>and</strong> most <strong>of</strong><br />
its length enclosed in a membrane (compare with<br />
P. armatus). Leg 2 similar to P. buccata except<br />
exopod inner 3 spines smaller <strong>and</strong> distal half with<br />
widely spaced spinules; endopod with 2 distinct<br />
patches <strong>of</strong> spinules. Leg 3 (Figure 94d) reduced to a<br />
spinulose process with a short spine at tip.<br />
REMARKS.—Yamaguti (1963:172) removed this<br />
species from Pseudocycnus in which it had been placed<br />
by Wilson. He designated the new genus Pseudocynopsis<br />
for this species <strong>and</strong> another new genus Pseudocycnoides<br />
to include P. armatus <strong>and</strong> also P.<br />
scomberomori (Yamaguti), both originally described<br />
as species <strong>of</strong> Pseudocycnus. We agree with Yamaguti<br />
that these 3 species should be removed from Pseudocycnus<br />
but we do not feel that placing P. buccata in<br />
a genus separate from P. armatus <strong>and</strong> P. scomberomori<br />
is justified. Consequently we have placed this<br />
species in the genus Pseudocycnoides. The original<br />
description <strong>of</strong> P. buccata was superficial <strong>and</strong> inaccurate<br />
<strong>and</strong> was undoubtedly the basis for Yamaguti's<br />
conclusions. Our studies <strong>of</strong> these 3 species indicate<br />
them to be much more closely related than previously<br />
known. These conclusions are based on the comparative<br />
morphology, not only <strong>of</strong> the female, but first<br />
descriptions <strong>of</strong> males <strong>of</strong> P. buccata <strong>and</strong> P. armatus as<br />
well. It should be pointed out that the first pair <strong>of</strong><br />
legs in all 3 <strong>of</strong> these species is very small, between<br />
the bases <strong>of</strong> the maxillipeds, <strong>and</strong> not easily seen.<br />
This species is found on all American species <strong>of</strong><br />
Scomberomorus (western Atlantic <strong>and</strong> eastern Pacific)<br />
<strong>and</strong> is relatively common on all its hosts.<br />
Examination <strong>of</strong> the type-specimen <strong>of</strong> Cybicola<br />
elongata Pearse (USNM 88538) leaves no doubt that<br />
it is the same as Wilson's species. The host for Pearse's<br />
material was Scomberomorus maculatus.<br />
The genus Pseudocycnopsis Yamaguti should be<br />
considered a synonym <strong>of</strong> Pseudocycnoides Yamaguti.<br />
Lernanthropus Blainville, 1822<br />
Lernanthropus kanagurta Tripathi, 1962<br />
FIGURE 94«-g<br />
Lernanthropus kanagurta Tripathi, 1962:194.<br />
MATERIAL EXAMINED.—1 collection containing 1 9<br />
from the gills <strong>of</strong> Rastrelliger brachysoma from Borneo.
NUMBER 311 45<br />
FEMALE.—Body form as in Figure 94e. Total length<br />
3.23 mm. Greatest width 1.35 mm. Cephalon about<br />
one-fourth total body length (not including posterior<br />
processes) <strong>and</strong> only about one-half greatest width. The<br />
single specimen was somewhat mutilated so we were<br />
not able to examine all <strong>of</strong> the appendages. The form<br />
<strong>of</strong> the second antenna <strong>and</strong> leg 1 are as in Figures 94/<br />
<strong>and</strong> 94g.<br />
REMARKS.—When Tripathi described this copepod<br />
he reported it from Megalaspis cordyla (Linnaeus)<br />
from India. Since it seems to be rare on species <strong>of</strong><br />
Rastrelliger it may be that Megalaspis (Carangidae)<br />
or some other host is preferred.<br />
Brachiella Cuvier, 1830<br />
Brachiella thynni Cuvier, 1830<br />
FIGURES 95a, 108<br />
Brachiella thynni Cuvier, 1830:257.<br />
Thynnicola ziegleri Miculicich, 1904:47.<br />
MATERIAL EXAMINED.—58 collections containing<br />
114 9 from the axil <strong>of</strong> the pectoral fin <strong>of</strong> the following<br />
hosts <strong>and</strong> localities: Acanthocybium sol<strong>and</strong>ri from<br />
Malagasy Republic, He Amsterdam, Seychelles, Palau<br />
Isl<strong>and</strong>, Yap Isl<strong>and</strong>, Kapingamarangi Atoll; Raroia<br />
Isl<strong>and</strong>, Line Isl<strong>and</strong>s, California, Nicaragua (Atlantic),<br />
Campeche, Brazil (north coast), Surinam, Azores;<br />
Thunnus albacares from Christmas Isl<strong>and</strong> (Pacific),<br />
Juan Fern<strong>and</strong>ez Isl<strong>and</strong>s, <strong>of</strong>f New Jersey, Azores;<br />
Thunnus obesus from Seychelles, Christmas Isl<strong>and</strong><br />
(Pacific), Hawaii, mid-North Atlantic (39°N, 44°W),<br />
Azores; Thunnus thynnus from east coast <strong>of</strong> United<br />
States, Portugal; Scomberomorus regalis from Leeward<br />
Isl<strong>and</strong>s.<br />
This species has been reported many times from<br />
scombrids <strong>and</strong> other hosts. It is usually attached to its<br />
host in the axil <strong>of</strong> the pectoral fin. This copepod is<br />
easily recognized <strong>and</strong> has been well described (both<br />
sexes) by Shiino (1956:238) <strong>and</strong> we will not repeat<br />
a description here.<br />
Brachiella magna Kabata, 1968<br />
FIGURES 95b, 108<br />
Brachiella magna Kabata, 1968b;508, fig. 2a-j<br />
MATERIAL EXAMINED.—3 collections containing 3 9<br />
from the gills <strong>and</strong> nasal lamellae <strong>of</strong> Scomberomorus<br />
commerson from Australia (New South Wales) <strong>and</strong><br />
S. sinensis (gills) from Hong Kong.<br />
The original description was based on a collection<br />
from the gills <strong>of</strong> S. commerson from <strong>of</strong>f Queensl<strong>and</strong>,<br />
Australia. Considering the number <strong>of</strong> specimens <strong>of</strong> the<br />
2 hosts examined (121) it is apparently uncommon on<br />
<strong>and</strong> known only from west Pacific Scomberomorus.<br />
Kabata has provided a good description with illustrations.<br />
Clavellisa Wilson, 1915<br />
Clavellisa scombri (Kurz, 1877)<br />
FIGURES 95C, 108<br />
Anchorella scombri Kurz, 1877:403.<br />
Clavella scombri.—Brian, 1906:116.<br />
Clavellisa scombri.—Wilson, 1915:694.<br />
MATERIAL EXAMINED.—10 collections containing<br />
17 9 from the following hosts <strong>and</strong> localities: Scomber<br />
japonicus from Philippines, Peru, Gulf <strong>of</strong> Mexico<br />
(Campeche <strong>and</strong> Alabama), Sierra Leone, Liberia;<br />
Scomber australasicus from Taiwan, Australia.<br />
This species was originally described from material<br />
collected from the gills <strong>of</strong> Scomber scombrus from<br />
Trieste. Our material was collected from the other 2<br />
species <strong>of</strong> Scomber. Since we examined 97 specimens<br />
<strong>of</strong> the type host without recovering this species we<br />
wonder if perhaps the earlier hosts were misidentified.<br />
Whatever the case, it seems apparent that this species<br />
is restricted to species <strong>of</strong> Scomber <strong>and</strong> is found<br />
wherever its hosts are. Later records by Yamaguti<br />
(1939) <strong>and</strong> Shiino (1959c) cite Scomber japonicus as<br />
the host species. Yamaguti (1939) redescribed this<br />
species <strong>and</strong> provided good illustrations. He inadvertently<br />
omitted this species in his 1963 synoptic survey<br />
<strong>of</strong> fish copepods.<br />
Clavellopsis Wilson, 1915<br />
Clavellopsis saba Yamaguti, 1939<br />
FIGURES 95d, 108<br />
Clavellopsis saba Yamaguti, 1939:558.<br />
This species was described from Japan from<br />
Scomber japonicus <strong>and</strong> reported again by Shiino<br />
(1959c: 367) from the same host from the Sea <strong>of</strong>
46<br />
Japan (Tsunodayama). During our studies we examined<br />
11 specimens <strong>of</strong> S. japonicus from Japan but<br />
did not recover this copepod.<br />
Shiino (1959c) has provided a good description<br />
with illustrations.<br />
Pennella Oken, 1816<br />
Pennella species<br />
Members <strong>of</strong> this genus have been reported many<br />
times from large marine pelagic animals. It is easily<br />
recognized attached to the body <strong>of</strong> the host; the head<br />
buried in the muscle tissue <strong>and</strong> the long worm<strong>like</strong><br />
body trailing free. Specimens have been recorded<br />
several inches long.<br />
This genus is in need <strong>of</strong> revision <strong>and</strong> species names<br />
should be used with caution. At least 6 species have<br />
been reported from whales, 7 from flyingfishes, <strong>and</strong> 4<br />
from swordfish. A revision would undoubtedly reduce<br />
these numbers <strong>of</strong> Pennella species.<br />
We have collected Pennella from Acanthocybium<br />
sol<strong>and</strong>ri <strong>and</strong> Thunnus thynnus. Because <strong>of</strong> the confusion<br />
surrounding the taxonomy <strong>of</strong> this genus we<br />
have not assigned species names to our specimens.<br />
Summary<br />
Our data, relative to infestation rates, are subject<br />
to considerable bias because <strong>of</strong> variables in collecting<br />
methods throughout the course <strong>of</strong> the study. Much <strong>of</strong><br />
the material was collecetd from preserved fish in<br />
museum collections. In these cases copepods usually<br />
found on the body surfaces <strong>of</strong> the hosts are lost. Consequently,<br />
rate <strong>of</strong> infestation data for each species,<br />
based on data from the entire collection, is biased.<br />
Nevertheless, we have included infestation rates in<br />
spite <strong>of</strong> this, as we feel that they do reflect, in a general<br />
way, host preferences <strong>and</strong> relative common-torare<br />
occurrences <strong>of</strong> the parasite species on their hosts.<br />
Selected collections will be considered in more detail<br />
in the joint work with Collette.<br />
The following is a list <strong>of</strong> scombrid fishes with the<br />
parasitic copepods collected from them during the<br />
course <strong>of</strong> this study. The number in parentheses after<br />
the host name indicates the number <strong>of</strong> individuals examined.<br />
The number in parentheses after the copepod<br />
name indicates the number <strong>of</strong> fish infested. The<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
copepods are listed with each host in descending order<br />
<strong>of</strong> frequency.<br />
SCOMBRINI<br />
Rastrelliger kanagurta (108)<br />
Pumiliopes capitulates (11)<br />
Nothobomolochus kanagurta (4)<br />
Rastrelliger brachysoma (33)<br />
Lernanthropus kanagurta (1)<br />
Rastrelliger faughni (14)<br />
Pumiliopes capitulatus (2)<br />
Nothobomolochus kanagurta (2)<br />
Orbitacolax aculeatus (2)<br />
Scomber scombrus (97)<br />
Caligus pelamydis (1)<br />
Scomber japonicus (500)<br />
Pumiliopes capitulatus (8)<br />
Clavellisa scombri (9)<br />
Caligus pelamydis (4)<br />
Caligus mutabilis (1)<br />
Clavelopsis saba<br />
Scomber australasicus (17)<br />
Clavellisa scombri (1)<br />
Pumiliopes capitulatus (1)<br />
SCOMBEROMORINI<br />
Acanthocybium sol<strong>and</strong>ri (61)<br />
Brachiella thynni (37)<br />
Gloiopotes hygomianus (26)<br />
Caligus productus (9)<br />
Caligus coryphaenae (1)<br />
Shiinoa occlusa (1)<br />
Pennella species (1)<br />
Grammatorcynus bicarinatus (37)<br />
Shiinoa occlusa (5)<br />
Caligus asymmetricus (4)<br />
Scomberomorus brasiliensis (62)<br />
Pseudocycnoides buccata (39)<br />
Holobomolochus divaricatus (14)<br />
Caligus mutabilis (4)<br />
Shiinoa inauris (3)<br />
Scomberomorus cavalla (36)<br />
Pseudocycnoides buccata (18)<br />
Holobomolochus asperatus (10)<br />
Caligus mutabilis (2)<br />
Caligus productus (1)<br />
Scomberomorus commerson (113)<br />
Pseudocycnoides armatus (20)<br />
Unicolax ciliatus (20)<br />
Shiinoa occlusa (11)
NUMBER 3 1 1 47<br />
Caligus biseriodentatus (11)<br />
Caligus cybii (10)<br />
Caligus infestans (5)<br />
Caligus asymmetricus (2)<br />
Brachiella magna (2)<br />
Tuxophorus cervicornis (2)<br />
Scomberomorus concolor (47)<br />
Pseudocycnoid.es buccata (14)<br />
Holobomolochus nudiusculus (13)<br />
Caligus omissus (7)<br />
Scomberomorus guttatus (55)<br />
Caligus biseriodentatus (16)<br />
Unicolax ciliatus (13)<br />
Pseudocycnoides armatus (2)<br />
Shiinoa occlusa (1)<br />
Scomberomorus koreanus (17)<br />
Caligus cybii (11)<br />
Pseudocycnoides armatus (3)<br />
Scomberomorus lineolatus (10)<br />
Pseudocycnoides armatus (1)<br />
Unicolax ciliatus (1)<br />
Caligus biseriodentatus (1)<br />
Scomberomorus maculatus (76)<br />
Pseudocycnoides buccata (27)<br />
Holobomolochus divaricatus (24)<br />
Shiinoa inauris (7)<br />
Caligus mutabilis (1)<br />
Scomberomorus multiradiatus (4)<br />
Pseudocycnoides armatus (2)<br />
Scomberomorus niphonius (18)<br />
Pseudocycnoides scomberomori (6)<br />
Unicolax ciliatus (2)<br />
Caligus pelamydis (2)<br />
Shiinoa occlusa (1)<br />
Scomberomorous plurilineatus (3)<br />
Pseudocycnoides armatus (3)<br />
Scomberomorus regalis (38)<br />
Pseudocycnoides buccata (12)<br />
Holobomolochus divaricatus (11)<br />
Shiinoa inauris (5)<br />
Caligus productus (3)<br />
Caligus bonito (1)<br />
Brachiella thynni (1)<br />
Tuxophorus collettei (1)<br />
Scomberomorus semifasciatus (17)<br />
Pseudocycnoides armatus (2)<br />
Unicolax ciliatus (2)<br />
Caligus cybii (1)<br />
Scomberomorus sierra (116)<br />
Pseudocycnoides buccata (48)<br />
Caligus omissus (39)<br />
Holobomolochus nudiusculus (28)<br />
Scomberomorus sinensis (8)<br />
Caligus cybii (2)<br />
Brachiella magna (1)<br />
Scomberomorus tritor (21)<br />
Unicolax ciliatus (4)<br />
Shiinoa occlusa (1)<br />
Caligus productus (1)<br />
Caligus diaphanus (1)<br />
Scomberomorus queensl<strong>and</strong>icus (19)<br />
Caligus biseriodentatus (11)<br />
Pseudocycnoides armatus (2)<br />
Unicolax ciliatus (1)<br />
Shiinoa occlusa (1)<br />
Scomberomorus species (3)<br />
Unicolax ciliatus (1)<br />
Caligus productus (1)<br />
Caligus cybii (1)<br />
Sardasarda (104)<br />
Caligus bonito (23)<br />
Ceratacolax euthynni (21)<br />
Caligus pelamydis (7)<br />
Caligus productus (1)<br />
Sar
48 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Auxis species (65)<br />
Unicolax collaterals (19)<br />
Unicolax mycterobius (9)<br />
Caligus productus (2)<br />
Caligus asymmetricus (1)<br />
Caligus coryphaenae (1)<br />
Caligus pelamydis (1)<br />
THUNNINI<br />
Euthynnus affinis (71)<br />
Unicolax collateralis (29)<br />
Caligus asymmetricus (5)<br />
Caligus re gaits (5)<br />
Pseudocycnus appendiculatus (4)<br />
Unicolax mycterobius (3)<br />
Caligus pelamydis (2)<br />
Caligus productus (1)<br />
Caligus bonito (1)<br />
Euthynnus alletteratus (64)<br />
Caligus coryphaenae (9)<br />
Unicolax collateralis (8)<br />
Ceratacolax euthynni (7)<br />
Caligus productus (5)<br />
Caligus bonito (4)<br />
Pseudocycnus appendiculatus (3)<br />
Unicolax mycterobius (3)<br />
Unicolax anonymous (2)<br />
Caligus pelamydis (1)<br />
Euthynnus lineatus (15)<br />
Unicolax collateralis (4)<br />
Caligus bonito (3)<br />
Ceratacolax euthynni (2)<br />
Unicolax mycterobius (1)<br />
Katsuwonus pelamis (132)<br />
Caligus coryphaenae (51)<br />
Caligus productus (51)<br />
Pseudocycnus appendiculatus (7)<br />
Unicolax reductus (3)<br />
Caligus asymmetricus (1)<br />
Thunnus alalunga (12)<br />
Elytrophora brachyptera (7)<br />
Caligus coryphaenae (1)<br />
Caligus productus (1)<br />
Pseudocycnus appendiculatus (1)<br />
Thunnus albacares (110)<br />
Caligus productus (49)<br />
Elytrophora brachyptera (39)<br />
Caligus coryphaenae (32)<br />
Pseudocycnus appendiculatus (21)<br />
Brachiella thynni (8)<br />
Caligus asymmetricus (1)<br />
Thunnus atlanticus (76)<br />
Caligus productus (70)<br />
Caligus coryphaenae (9)<br />
Elytrophora brachyptera (1)<br />
Thunnus maccoyii (2)<br />
Elytrophora brachyptera (2)<br />
Thunnus obesus (40)<br />
Elytrophora brachyptera (20)<br />
Caligus coryphaenae (18)<br />
Brachiella thynni (10)<br />
Elytrophora indica (9)<br />
Pseudocycnus appendiculatus (3)<br />
Thunnus thynnus (57)<br />
Caligus coryphaenae (16)<br />
Caligus productus (16)<br />
Elytrophora brachyptera (11)<br />
Pennella species (3)<br />
Brachiella thynni (2)<br />
Caligus bonito (1)<br />
Pseudocycnus appendiculatus (1)<br />
Thunnus tonggol (26)<br />
Pseudocycnus appendiculatus (7)<br />
Below is a list <strong>of</strong> the copepods <strong>and</strong> the fishes on<br />
which they were found. The number in parentheses<br />
after the host name indicates the infestation rate<br />
(number <strong>of</strong> infested fish/number <strong>of</strong> fish examined).<br />
We remind the reader <strong>of</strong> the bias in the infestation<br />
rates discussed above. No number after a fish name<br />
indicates the record is from the literature.<br />
BOMOLOCHIDAE<br />
Holobomolochus divaricatus<br />
Scomberomorus maculatus (32)<br />
Scomberomorus regalis (29)<br />
Scomberomorus brasiliensis (23)<br />
Holobomolochus nudiusculus<br />
Scomberomorus concolor (28)<br />
Scomberomorus sierra (24)<br />
Holobomolochus asperatus<br />
Scomberomorus cavalla (28)<br />
Unicolax collateralis<br />
Euthynnus affinis (41)<br />
^4uxu species (29)<br />
Euthynnus lineatus (27)<br />
Sarda orientalis (21)<br />
Orcynopsis unicolor (17)<br />
Cybiosarda elegans (13)<br />
Euthynnus alletteratus (13)<br />
Unicolax anonymous<br />
Euthynnus alletteratus (3)<br />
Unicolax mycterobius<br />
Auxis species (14)<br />
Euthynnus alletteratus (5)<br />
Euthynnus affinis (4)
NUMBER 311 49<br />
Unicolax ciliatus<br />
Scomberomorus gut talus (24)<br />
Scomberomorus tritor (19)<br />
Scomberomorus commerson (18)<br />
Scomberomorus semifasciatus (12)<br />
Scomberomorus niphonius (11)<br />
Scomberomorus lineolatus (10)<br />
Unicolax reductus<br />
Katsuwonus pelamis (2)<br />
Ceratacolax euthynni<br />
Sarda sarda (20)<br />
Euthynnus alletteratus (14)<br />
Nothobomolochus kanagurta<br />
Rastrelliger faughni (14)<br />
Rastrelliger kanagurta (4)<br />
Rastrelliger species<br />
Orbitacolax aculeatus<br />
Rastrelliger faughni<br />
Pumiliopes capitulatus<br />
Rastrelliger faughni (14)<br />
Rastrelliger kanagurta (10)<br />
Scomber japonicus (2)<br />
Scomber scombrus (1)<br />
SHIINOIDAE<br />
Shiinoa inauris<br />
Scomberomorus regalis (13)<br />
Scomberomorus maculatus (9)<br />
Scomberomorus brasiliensis (5)<br />
Shiinoa occlusa<br />
Grammatorcynus bicarinatus (14)<br />
Gymnosarda unicolor (14)<br />
Scomberomorus commerson (10)<br />
Scomberomorus niphonius (6)<br />
Scomberomorus queensl<strong>and</strong>icus (5)<br />
Scomberomorus guttatus (1)<br />
Scomberomorus tritor (1)<br />
Acanthocybium sol<strong>and</strong>ri (1)<br />
CALIGIDAE<br />
Caligus coryphaenae<br />
Thunnus obesus (45)<br />
Katsuwonus pelamis (38)<br />
Thunnus albacares (29)<br />
Thunnus thynnus (28)<br />
Euthynnus alletteratus (14)<br />
Thunnus atlanticus (12)<br />
Thunnus alalunga (8)<br />
Auxis species (1)<br />
Caligus regalis<br />
Euthynnus affinis (70)<br />
Caligus productus<br />
Thunnus atlanticus (92)<br />
Thunnus albacares (45)<br />
Katsuwonus pelamis (39)<br />
Thunnus thynnus (28)<br />
Acanthocybium sol<strong>and</strong>ri (15)<br />
Sarda orient alls (13)<br />
Euthynnus alletteratus (8)<br />
Thunnus alalunga (8)<br />
Scomberomorus regalis (8)<br />
Scomberomorus tritor (5)<br />
Scomberomorus cavalla (3)<br />
Auxis species (3)<br />
Sarda chiliensis lineolatus (2)<br />
Euthynnus affinis (1)<br />
Sarda sarda (1)<br />
Scomberomorus species<br />
Caligus asymmetricus<br />
Cybiosarda elegans (25)<br />
Sarda orientalis (21)<br />
Grammatorcynus bicarinatus (11)<br />
Sarda australis (10)<br />
Euthynnus affinis (7)<br />
^4uxu species (2)<br />
Scomberomorus commerson (2)<br />
Katsuwonus pelamis (1)<br />
Thunnus albacares (1)<br />
Caligus bonito<br />
Sarda australis (65)<br />
Sarda chiliensis chiliensis (54)<br />
Sarda chiliensis lineolatus (35)<br />
Sarda orientalis (39)<br />
Euthynnus lineatus (20)<br />
Gymnosarda unicolor (14)<br />
Euthynnus alletteratus (6)<br />
Scomberomorus regalis (3)<br />
Thunnus thynnus (2)<br />
Euthynnus affinis (1)<br />
Caligus mutabilis<br />
Scomberomorus brasiliensis (6)<br />
Scomberomorus cavalla (6)<br />
Scomberomorus maculatus (1)<br />
Scomber japonicus (1)<br />
Caligus omissus<br />
Scomberomorus sierra (34)<br />
Scomberomorus concolor (15)<br />
Caligus biseriodentatus<br />
Scomberomorus queensl<strong>and</strong>icus (58)<br />
Scomberomorus guttatus (29)<br />
Scomberomorus commerson (10)<br />
Scomberomorus lineolatus (10)<br />
species<br />
Caligus cybii<br />
Scomberomorus koreanus (65)<br />
Scomberomorus sinensis (25)<br />
Scomberomorus species (20)
50 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
Scomberomorus commerson (9)<br />
Scomberomorus semifasciatus (6)<br />
Caligus pelamydis<br />
Sarda australis (55)<br />
Scomberomorus niphonius (11)<br />
Sarda chiliensis lineolatus (10)<br />
Sarda sarda (7)<br />
Euthynnus affinis (3)<br />
Euthynnus alletteratus (2)<br />
Auxis species (2)<br />
Scomber japonicus (1)<br />
Scomber scombrus (1)<br />
Caligus infestans<br />
Scomberomorus commerson (4)<br />
Caligus diaphanus*<br />
Scomberomorus tritor (5)<br />
Caligus savala*<br />
Euthynnus affinis<br />
Caligus macarovi*<br />
Auxis species<br />
Caligus amblygenitalis*<br />
Euthynnus affinis<br />
Caligus pseudokalumai<br />
Gymnosarda unicolor<br />
Elytrophora brachyptera<br />
Allothunnus fallal (100)<br />
Thunnus maccoyii (100)<br />
Thunnus alalunga (58)<br />
Thunnus obesus (50)<br />
Thunnus albacares (35)<br />
Thunnus thynnus (19)<br />
Thunnus atlanticus (1)<br />
Elytrophora indica<br />
Thunnus obesus (23)<br />
EURYPHORIDAE<br />
Gloiopotes hygomianus<br />
Acanthocybium sol<strong>and</strong>ri (43)<br />
Caligulus longispinosus<br />
Euthynnus affinis<br />
TUXOPHORIDAE<br />
Tuxophorus cybii<br />
Scomberomorus commerson<br />
Acanthocybium sol<strong>and</strong>ri<br />
Tuxophorus cervicornis<br />
Scomberomorus commerson (2)<br />
Tuxophorus collettei<br />
Scomberomorus regalis (3)<br />
PSEUDOCYCNIDAE<br />
Pseudocycnus appendiculatus<br />
Thunnus tonggol (27)<br />
Thunnus albacares (19)<br />
Thunnus obesus (8)<br />
Euthynnus affinis (6)<br />
Euthynnus alletteratus (5)<br />
Katsuwonus pelamis (5)<br />
Pseudocycnoides armatus<br />
Scomberomorus plurilineatus (100)<br />
Scomberomorus koreanus (18)<br />
Scomberomorus commerson (18)<br />
Scomberomorus semifasciatus (12)<br />
Scomberomorus queensl<strong>and</strong>icus (11)<br />
Scomberomorus lineolatus (10)<br />
Scomberomorus guttatus (4)<br />
Pseudocycnoides scomberomori<br />
Scomberomorus niphonius (33)<br />
Pseudocycnoides buccata<br />
Scomberomorus brasiliensis (63)<br />
Scomberomorus cavalla (50)<br />
Scomberomorus sierra (41)<br />
Scomberomorus maculatus (36)<br />
Scomberomorus regalis (32)<br />
Scomberomorus concolor (30)<br />
LERNANTHROPIDAE<br />
Lernanthropus kanagurta*<br />
Rastrelliger brachysoma (3)<br />
LERNEOPODIDAE<br />
Brachiella thynni<br />
Acanthocybium sol<strong>and</strong>ri (61)<br />
Thunnus obesus (25)<br />
Thunnus albacares (7)<br />
Thunnus thynnus (4)<br />
Scomberomorus regalis (3)<br />
Brachiella magna<br />
Scomberomorus sinensis (13)<br />
Scomberomorus commerson (2)<br />
Clavellisa scombri<br />
Scomber australasicus (6)<br />
Scomber japonicus (2)<br />
Clavellopsis saba<br />
Scomber japonicus<br />
* Probably not usually scombrid parasites.
Bassett-Smith, P. W.<br />
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Br<strong>and</strong>es, C. H.<br />
1955. Uber eine neue Art der Parasitischen Copepoden:<br />
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Brian, A.<br />
1906. Copepodi Parassiti dei Pesci a"Italia. 187 pages.<br />
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1960. <strong>Parasitic</strong> Copepoda from Mexican Coastal <strong>Fishes</strong>.<br />
Bulletin <strong>of</strong> Marine Science <strong>of</strong> the Gulf <strong>and</strong> Caribbean,<br />
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1975. Systematics <strong>and</strong> Morphology <strong>of</strong> the Bonitos<br />
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Cressey, R. F., <strong>and</strong> H. Boyle<br />
1973. Five New Bomolochid <strong>Copepods</strong> <strong>Parasitic</strong> on<br />
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1830. Le Regne Animal distribui d'apres son Organization.<br />
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the Family Dichelesthiidae. Proceedings <strong>of</strong> the<br />
United States National Museum, 60(2400): 1-100.<br />
1935. New <strong>Parasitic</strong> <strong>Copepods</strong>. Smithsonian Miscellaneous<br />
Collections, 91 (19): 1-9.<br />
1937. <strong>Parasitic</strong> <strong>Copepods</strong> Taken During the Third Hancock<br />
Expedition to the Galapagos Isl<strong>and</strong>s. Allan<br />
Hancock Pacific Expedition, 2(4): 23-30.<br />
Yamaguti, S.<br />
1936. <strong>Parasitic</strong> <strong>Copepods</strong> from <strong>Fishes</strong> <strong>of</strong> Japan, part 2:<br />
Caligoida, I. 22 pages, [private publication.]<br />
1939. <strong>Parasitic</strong> <strong>Copepods</strong> from <strong>Fishes</strong> <strong>of</strong> Japan, part 5:<br />
Caligoida, III. Volumen Jubilare Pro Pr<strong>of</strong>. Sadao<br />
Yoshida 3:443-487.<br />
1963. <strong>Parasitic</strong> Copepoda <strong>and</strong> Branchiura <strong>of</strong> <strong>Fishes</strong>.<br />
1104 pages. New York: Interscience Publishers.
Figures<br />
FIGURE 1.—Holobomolochus divaricatus, new species, female: a, dorsal; b, genital segment <strong>and</strong><br />
abdomen, ventral; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, first antenna.<br />
54
NUMBER 3 1 1 55<br />
E<br />
D<br />
FIGURE 2.—Holobomolochus divaricatus, new species, female: a, second antenna; b, m<strong>and</strong>ible,<br />
paragnath, first maxilla, second maxilla; c, maxilliped; d, leg 1; e, leg 2.
56 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 3.—Holobomolochus divaricatus, new species, female: a, leg 3; b, leg 4; c, leg 5; male:<br />
d, dorsal.
NUMBER 3 1 1 57<br />
D<br />
FIGURE 4.—Holobomolochus divaricatus, new species, male: a, genital segment <strong>and</strong> abdomen,<br />
ventral; b, last abdominal segment <strong>and</strong> caudal rami, ventral; c, first antenna; d, maxilliped;<br />
e, leg 1.<br />
E
58<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 5.—Holobomolochus divaricatus, new species, male: a, leg 3; b, leg 4; c, leg 5.<br />
Holobomolochus nudiusculus, new species, female: d, dorsal; e, genital segment <strong>and</strong> abdomen,<br />
ventral.
NUMBER 3 1 1 59<br />
FIGURE 6.—Holobomolochus nudiusculus, new species, female: a, last abdominal segment <strong>and</strong><br />
caudal rami, ventral; b, leg 2; c, leg 3; d, leg 5; male: e, dorsal.
60<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 7.—Holobomolochus nudiusculus, new species, male: a, genital segment <strong>and</strong> abdomen,<br />
ventral; b, last abdominal segment <strong>and</strong> caudal rami, ventral. Holobomolochus asperatus, new<br />
species, female: c, dorsal; d, genital segment <strong>and</strong> abdomen, dorsal; e, last abdominal segment<br />
<strong>and</strong> caudal rami, ventral; /, first antenna; g, second antenna.
NUMBER 3 1 1 61<br />
FIGURE 8.—Holobomolochus asperatus, new species, female; a, m<strong>and</strong>ible, paragnath, first<br />
maxilla, second maxilla; b, leg 2; c, leg 3; d, leg 4; e, leg 5.
62 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 9.—Unicolax collateralis, new genus, new species, female: a, dorsal; b, genital segment<br />
<strong>and</strong> abdomen, dorsal; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, first antenna;<br />
e, second antenna.
NUMBER 311 63<br />
FIGURE 10.—Unicolax collateralis, new genus, new species, female: a, labrum, m<strong>and</strong>ible,<br />
paragnath, first maxilla, second maxilla; b, maxilliped; c, leg 1; d, leg 2.
64<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 11.—Unicolax collaterals, new genus, new species, female: a, leg 3; b, leg 4; c, leg 5;<br />
male: d, dorsal; e, genital segment <strong>and</strong> abdomen, dorsal.
NUMBER 3 1 1 65<br />
FIGURE 12.—Unicolax collateralis, new genus, new species, male: a, last abdominal segment<br />
<strong>and</strong> caudal rami, ventral; b, first antenna; c, maxilliped; d, leg 1; e, leg 2.
66<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 13.—Unicolax collaterals, new genus, new species, male: a, leg 3; b, leg 4; c, leg 5.
NUMBER 3 1 1 67<br />
B<br />
D<br />
FIGURE 14.—Unicolax anonymous (Vervoort), new genus, female: a, dorsal; b, first antenna;<br />
c, second antenna; d, m<strong>and</strong>ible, paragnath, first maxilla, second maxilla; e, maxilliped.<br />
E
68 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
B<br />
FIGURE 15.—Unicolax anonymous (Vervoort), new genus, female: a, leg 1; b, leg 2.
NUMBER 3 1 1 69<br />
FIGURE 16.—Unicolax anonymous (Vervoort), new genus, female: a, leg 3; b, leg 4; c, leg 5;<br />
male: d, dorsal; e, leg 5.<br />
E
70 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 17.—Unicolax mycterobius (Vervoort), new genus, female: a, dorsal; b, leg 2; c, leg 3.<br />
B
NUMBER 3 1 1 71<br />
FIGURE 18.—Unicolax mycterobius (Vervoort), new genus, female: a, leg 4; b, leg 5; male:<br />
c, dorsal; d, last abdominal segment <strong>and</strong> caudal raini, ventral; e, leg 1; /, leg 1 exopod.
72 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 19.—Unicolax mycterobius (Vervoort), new genus, male: a, leg 2; b, leg 3; c, leg 4;<br />
d, leg 4 last 2 endopod segments.
NUMBER 3 1 1 73<br />
B<br />
FIGURE 20.—Unicolax ciliatus, new genus, new species, female: a, dorsal; b, first antenna; e,<br />
leg 1 exopod; d, leg 2 exopod.
74<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 21.—Unicolax ciliatus, new genus, new species, female: a, leg 3; b, leg 4; c, leg 5; male:<br />
d, dorsal; e, last abdominal segment <strong>and</strong> caudal rami, ventral; /, leg 1 endopod.
NUMBER 311 75<br />
B<br />
FIGURE 22.—Unicolax ciliatus, new genus, new species, male: a, leg 2; b, leg 3; c, leg 4;<br />
d, leg 5.
76<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 23.—Unicolax reductus new genus, new species, female: a, dorsal; b, genital segment<br />
<strong>and</strong> abdomen, dorsal; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, first antenna;<br />
e, second antenna; /, m<strong>and</strong>ible, paragnath, first maxilla, second maxilla.
NUMBER 3 1 1 77<br />
B<br />
FIGURE 24.—Unicolax reductus, new genus, new species, female: a, maxilliped; b, leg 1; c,<br />
leg 2 \d, leg 3.
78 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
D<br />
FIGURE 25.—Unicolax reductus, new genus, new species, female: a, leg 4; b, leg 5; male: c,<br />
dorsal; d, genital segment <strong>and</strong> abdomen, ventral; e, last abdominal segment <strong>and</strong> caudal rami,<br />
ventral.
NUMBER 3 1 1 79<br />
FIGURE 26.—Unicolax reductus, new genus, new species, male: a, maxilliped; b, leg 1; c, leg<br />
2; d, leg 5.
80 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 27.—Ceratacolax euthynni Vervoort, female: a, dorsal; b, lateral; c, genital segment<br />
<strong>and</strong> abdomen, ventral; d, last abdominal segment <strong>and</strong> caudal rami; e, first antenna; /, second<br />
antenna; g, m<strong>and</strong>ible, paragnath, first <strong>and</strong> second maxilla.
NUMBER 3 1 1 81<br />
D \<br />
FIGURE 28.—Ceratacolax euthynni Vervoort, female: a, maxilliped; b, leg 1; c, leg 2; d, leg 3.
82 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
E<br />
FIGURE 29.—Ceratacolax euthynni Vervoort, female: a, leg 4; b, leg 5; male: c, dorsal; d,<br />
genital segment <strong>and</strong> abdomen, ventral; e, last abdominal segment <strong>and</strong> caudal rami, ventral;<br />
/, first antenna.<br />
D
NUMBER 311 83<br />
B<br />
D<br />
FIGURE 30.—Ceratacolax euthynni Vervoort, male: a, second antenna; b, maxilliped; c, leg 1;<br />
d, leg 2.
84 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 31.—Ceratacolax euthynni Vervoort, male: a, leg 3; b, leg 4; c, leg 5.<br />
s
NUMBER 3 1 1 85<br />
B<br />
FIGURE 32.—Nothobomolochus kanagurta Pillai, female: a, dorsal; b, last abdominal segment<br />
<strong>and</strong> abdomen, ventral; c, first antenna; d, maxilliped.
86<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 33.—Nothobomolochus kanagurta Pillai, female: a, leg 2; b. leg 3; c, leg 4; d, leg 5.
NUMBER 311 87<br />
FIGURE 34.—Orbitacolax aculeatus (Pillai), female: a, dorsal; b, first antenna; c, second antenna;<br />
d, oral area; e, maxilliped; /, leg 1.<br />
D
88<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 35.—Orbitacolax aculeatus (Pillai), female: a, leg 2; b, leg 5. Pumiliopes capitulatus<br />
Cressey <strong>and</strong> Boyle, female: c, dorsal; d, genital segment, abdomen, caudal rami, ventral; e, last<br />
abdominal segment <strong>and</strong> caudal rarni, ventral.<br />
D<br />
E
NUMBER 3 1 1 89<br />
B<br />
FIGURE 36.—Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, female: a, first antenna; b, second antenna<br />
; c, oral area; d, maxilliped; e, leg 1.<br />
D
90 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 37.—Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, female: a, leg 2; b, leg 3; c, leg 4;<br />
d, leg 5.<br />
B<br />
D
NUMBER 3 1 1 91<br />
D<br />
FIGURE 38.—Shiinoa inauris Cressey, female: a, lateral with attached male; b, rostral area,<br />
lateral; c, oral area; d, leg 1.
92<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 39.—Shiinoa inauris Cressey, female: a, leg 2; b, leg 3; male: c, second antenna;<br />
d, exopod <strong>of</strong> leg 2. Shiinoa occlusa Kabata, female: e, lateral; male: /, genital segment <strong>and</strong><br />
abdomen; g, caudal ramus; h, second antenna.
NUMBER 3 1 1<br />
FIGURE 40.—Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, female: a, dorsal; b, caudal ramus,<br />
ventral; c, sternal furea; d, leg 1; e, leg 2 endopod; /, leg 3 exopod.<br />
E<br />
B<br />
93
94<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 41.—Caligus coryphaenae Steenstrup <strong>and</strong> Lutken, female: a, leg 4 exopod; male: b,<br />
dorsal. Caligus regalis Leigh-Sharpe, female: c, dorsal; d, sternal furca; e, leg 3 exopod; /, leg<br />
4 exopod: male: g, genital segment <strong>and</strong> abdomen, ventral.
NUMBER 3 1 1 95<br />
FIGURE 42.—Caligus productus Miiller, female: a, dorsal; b, last abdominal segment <strong>and</strong><br />
caudal rami, ventral; c, oral area; d, first antenna; e, second antenna.<br />
B
96<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 43.—Caligus productus Miiller, female: a, second maxilla; b, maxilliped; c, sternal<br />
furca; d, leg 1; e, leg 2.
NUMBER 3 1 1 97<br />
FIGURE 44.—Caligus productus Muller, female: a, leg 3; b, leg 4; male: c, dorsal; ,d, genital<br />
segment <strong>and</strong> abdomen; e, second antenna.<br />
E<br />
B
98<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 45.—Caligns asymmetricus Kabata, female: a, dorsal; b, abdomen <strong>and</strong> caudal rami,<br />
ventral; c, oral area; d, first antenna; e, second antenna.
NUMBER 3 1 1<br />
D<br />
FIGURE 46.—Caligus asymmetricus Kabata, female: a, second maxilla; b, maxilliped; c, sternal<br />
furca; d, leg 1; e, leg 2.<br />
E<br />
99
100<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 47.—Caligus asymmetricus Kabata, female: a, leg 3; b, leg 4; male: c, dorsal; d, genital<br />
segment <strong>and</strong> abdomen, ventral; e, second antenna.
NUMBER 311<br />
FIGURE 48.—Caligus bonito Wilson, female: a, dorsal; b, posterior portion <strong>of</strong> abdomen <strong>and</strong><br />
caudal rami, ventral; c, oral area; d, first antenna; e, second antenna.<br />
101
102<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 49.—Caligns bonito Wilson, female: a, second maxilla; b, maxilliped; c, sternal furca;<br />
d, leg 1; e, leg 2; /, detail <strong>of</strong> outer edge <strong>of</strong> leg 2 endopod second segment.
NUMBER 311 103<br />
FIGURE 50.—Caligus bonito Wilson, female: a, leg 3; b, leg 4; male: c, dorsal; d, second<br />
antenna; e, distal portion <strong>of</strong> maxilliped.<br />
D
104<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 51.—Caligus mutabilis Wilson, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, first antenna; «, postantennal<br />
process; /, second antenna.<br />
B<br />
D
NUMBER 3 1 1 105<br />
FIGURE 52.—Caligus mutabilis Wilson, female: a, postoral process; b, sternal furca; c, oral<br />
area; d, leg 1; e, leg 2.
106<br />
c<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 53.—Caligus mutabilis Wilson, female: a, leg 3; b, leg 4. Caligns omissus, new species;<br />
female: c, dorsal; d, genital segment <strong>and</strong> abdomen, ventral; e, last abdominal segment <strong>and</strong><br />
caudal ranii, ventral.
NUMBER 3 1 1 107<br />
FIGURE 54.—Caligus omissus, new species, female: a, oral area; b, first antenna; c, postantennal<br />
process; d, second antenna; e, postoral process; /, maxilliped; g, sternal furca.
108<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 55.—Caligus omissus, new species, female: a, leg 1; b, leg 2; c, leg o; d, leg 4.<br />
B
NUMBER 3 1 1 109<br />
FIGURE 56.—Caligus omissus, new species, male: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, second antenna; d, postantennal process; e, postoral process; /, maxilliped; g, sternal<br />
furca.
110 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 57.—Caligus biseriodentatus Shen, female: a, dorsal; b, abdomen <strong>and</strong> caudal rami,<br />
ventral; c, cephalon, ventral; d, leg 1; e, leg 2 endopod.
NUMBER 3 1 1 111<br />
FIGURE 58.—Caligus biseriodentatus Shen, female: a, leg 3 exopod; b, leg 4; male: c, dorsal;<br />
immature female: d, dorsal; e, maxilliped; /, sternal furca; g, leg 1 last segment.
112<br />
E<br />
B<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 59.—Caligus biseriodentatus Shen, immature female: a, leg 2; b, leg 4; immature male:<br />
c, dorsal; d, tip <strong>of</strong> abdomen <strong>and</strong> caudal ramus, ventral; e, postantennal process; /, maxilliped.
NUMBER 311 113<br />
B<br />
FIGURE 60.—Caligus cybii Bassett-Smith, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, oral area; e, first antenna.
114<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 61.—Caligus cybii Bassett-Smith, female: a, postantennal process; b, second antenna;<br />
c, postoral process; d, second maxilla; e, maxilliped; /, sternal furca; g, leg 1.
NUMBER 3 1 1<br />
FIGURE 62.—Caligus cybii Bassett-Smith, female: a, leg 2; 6, leg 3; c, leg 4; male: d, dorsal.<br />
115
116<br />
D<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 63.—Caligus cybii Bassett-Smith, male: a, genital segment <strong>and</strong> abdomen, ventral;<br />
b, second antenna; c, postoral process; d, maxilliped.
NUMBER 3 1 1 117<br />
FIGURE 64.—Caligus pelamydis Kroyer, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; e, oral area; d, first antenna; e, second antenna.<br />
B
118 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 65.—Caligns pelamydis Kroyer, female: a, second maxilla; b, maxilliped; c, sternal<br />
furca; d, leg 1; e, leg 2.<br />
E
NUMBER 3 1 1 119<br />
FIGURE 66.—Caligns pelamydis Kroyer, female: a, leg 3; b, leg 4; male: e, dorsal; d, genital<br />
segment <strong>and</strong> abdomen, ventral; e, postoral process; /, maxilliped.
120<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 67.—Caligus infestans Heller, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, last abdominal segment <strong>and</strong> caudal rami, ventral; d, oral area; e, first antenna.
NUMBER 3 1 1 121<br />
B<br />
FIGURE 68.—Caligus infestans Heller, female: a, second antenna; b, tip <strong>of</strong> second maxilla;<br />
c, maxilliped: d, sternal furca; e, leg 1; /, leg 2.<br />
F
122<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 69.—Caligus infestans Heller, female: a, leg 3; b, leg 4; male: c, dorsal; d, genital<br />
segment <strong>and</strong> abdomen, ventral; e, second antenna.<br />
B
NUMBER 3 1 1 123<br />
FIGURE 70.—Caligus diaphanus Nordmann, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, distal end <strong>of</strong> abdomen <strong>and</strong> caudal rami, ventral; d, first antenna; e, postantennal<br />
process; /, second antenna; g, postoral process.
124<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 71.—Caligns diaphanus Nordmann, female: a, second maxilla; b, maxilliped; c, sternal<br />
furca; d, oral area; e, leg 1; /, leg 2.
NUMBER 311 125<br />
FIGURE 72.—Caligus diaphanus Nordmann, female: a, leg 3; b, leg 4; male: c, dorsal; d, second<br />
antenna; e, postoral process; /, maxilliped.<br />
B
126<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 73.—Caligus savala Gnanamuthu, female: a, dorsal; b, second antenna; c, postantennal<br />
process; d, sternal furca; e, leg 2 endopod; /, leg 4 exopod last segment. Caligus macarovi<br />
Gussev, female: g, dorsal; h, second antenna, postantennal process, postoral process; i, sternal<br />
furca. (C macarovi after Shiino 1959.)
NUMBER 3 1 1 127<br />
FIGURE 74.—Caligus macarovi Gussev, female: a, leg 2 endopod; b, leg 4. Caligus amblygenitalis<br />
Pillai, female: c, dorsal; d, sternal furca; e, leg 1; /, leg 2 endopod edge; g, leg 2<br />
exopod; h, leg 4. (C. macarovi after Shiino 1959, C. amblygenitalis after Pillai 1961.)
128 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 75.-—Elytrophora brachyptera Gerstaeckcr, female: a, dorsal; b, caudal ramus; c, first<br />
antenna; d, second antenna; e, mouth tube <strong>and</strong> postoral process; /, second maxilla; g, maxilliped.
NUMBER 3 1 1 129<br />
FIGURE 76.—Elytrophora brachyptera Gerstaecker, female: a, sternal furca; b, leg 1; c, leg 2;<br />
d, leg 3; e, leg 3 endopod.<br />
D
130<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 77.—Elytrophora brachyptera Gerstaecker, female: a, leg 3 exopod; b, leg 4 (cold<br />
water; c, leg 4 (warm water); male: d, dorsal; e, genital segment <strong>and</strong> abdomen, ventral;<br />
/, second antenna; g, maxilliped.
NUMBER 3 1 1 131<br />
FIGURE 78.—Elytrophora indica Shiino, female: a, dorsal; b, genital segment <strong>and</strong> abdomen,<br />
ventral; c, first antenna; d, second antenna; e, mouth tube <strong>and</strong> postoral process; /, leg 4;<br />
g, leg 6.<br />
E
132<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 79.—Elytrophora indica Shiino, male: a, dorsal; b, second antenna. Gloiopotes<br />
hygomianus Steenstrup <strong>and</strong> Lutken, female: c, dorsal; d, sternal furca; e, leg 1; f, tip <strong>of</strong><br />
exopod <strong>of</strong> leg 1; g, endopod <strong>of</strong> leg 1; h, leg 4; male: i, dorsal.
NUMBER 3 1 1 133<br />
FIGURE 80.—Caligulus longispinosus Heegaard, female: a, dorsal; male: b, dorsal; c, maxilliped;<br />
d, sternal furca; e, leg 1; /, leg 2 (female after Heegaard, 1962).
134 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
D<br />
B<br />
FIGURE 81.—Tuxophorus cybii Nunes-Ruivo <strong>and</strong> Fourmanoir, female: a, dorsal. Tuxophorus<br />
cervicornis Heegaard, female: b, dorsal; c, second antenna; d, postantennal process; e, sternal<br />
furca; /, leg 1; g, leg 4. (7\ cybii after N.-R <strong>and</strong> Fourmanoir, 1956.)
NUMBER 3 1 1 135<br />
A<br />
FIGURE 82.—Tuxophorus collettei, new species, female: a, dorsal; b, genital segment <strong>and</strong><br />
abdomen, ventral; c, caudal rami, ventral; d, first antenna; e, second antenna <strong>and</strong> postantennal<br />
process; /, postoral process.
136<br />
D<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 83.—Tuxophorus collettei, new species, female: a, second maxilla; b, maxilliped;<br />
c, sternal furca; d, leg 1; e, leg 2.
NUMBER 3 1 1 137<br />
FIGURE 84.—Tuxophorus collettei, new species, female: a, leg 3; b, leg 4; male: c, dorsal;<br />
d, genital segment <strong>and</strong> abdomen, ventral; e, second antenna; /, maxilliped.
138<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 85.—Pseudocycnus appendiculatus Heller, female: a, dorsal; b, first antenna; c, second<br />
antenna; d, mouth tube <strong>and</strong> m<strong>and</strong>ible; e, first maxilla; /, second maxilla.
NUMBER 3 1 1 139<br />
FIGURE 86.—Pseudocycnus appendiculatus Heller, female: a, maxilliped; b, leg 1; c, leg 2;<br />
d, leg 3.<br />
D
140 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
D<br />
FIGURE 87.—Pseudocycnus appendiculatus Heller, male: a, dorsal; b, abdomen <strong>and</strong> caudal<br />
rami, ventral; c, first antenna; d, maxilliped; e, leg 1; /, leg 4.<br />
B
NUMBER 3 1 1 141<br />
FIGURE 88.—Pseudocycnoides armatus (Bassett-Smith), female: a, dorsal; b, first antenna;<br />
c, first <strong>and</strong> second antennae; d, mouth tube; e, second maxilla.<br />
D
142 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 89.—Pseudocycnoides armatus (Bassett-Smith), female: a, maxilliped; b, leg 1;<br />
c, leg 2; d, leg 3; male: e, dorsal.
NUMBER 3 1 1 143<br />
E<br />
FIGURE 90.—Pseudocycnoides armatus (Bassett-Smith), male: a, abdomen <strong>and</strong> caudal rami;<br />
b, first antenna; c, second maxilla; d, maxilliped; e, leg 1.
144<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 91.—Pseudocycnoides armatus (Bassett-Smith), male: a, leg 2; b, leg 3. Pseudocycnoides<br />
scomberomori (Yamaguti), female: c, dorsal; d, maxilliped; e, leg 1; /, leg 2;<br />
g. ^g 3.
NUMBER 311 145<br />
FIGURE 92.—Pseudocycnoides buccata (Wilson), female: a, dorsal; b, abdomen <strong>and</strong> caudal<br />
rarni, young female, ventral; c, first antenna; d, second antenna; e, mouth tube; /, first<br />
maxilla; g, second maxilla.
146 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 93.—Pseudocycnoides buccata (Wilson), female: a, maxilliped; b, claw <strong>of</strong> maxilliped;<br />
c, legs 1-3; male: d, dorsal; e, abdomen <strong>and</strong> caudal ramus, ventral; /, second antenna.
NUMBER 3 1 1 147<br />
FIGURE 94.—Pseudocycnoid.es buccata (Wilson), male: a, first maxilla, m<strong>and</strong>ible <strong>and</strong> mouth<br />
tube; b, maxilliped; c, leg 1; d, leg 3. Lernanthropus kanagurta Tripathi, female: e, dorsal;<br />
/, second antenna; g, leg 1.<br />
E
148<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 95.—Brachiella thynni Cuvier, female: a, ventral. Brachiella magna Kabata: b, dorsal.<br />
Clavellisa scombri (Kurz), female: c, ventral. Clavelliopsis saba Yamaguti, female: d, lateral.<br />
(5. thynni after Shiino, 1956; C. saba after Shiino, 1959c.)
NUMBER 3 11 149<br />
o divaricatus<br />
• nudiusculus<br />
FIGURE 96.—Distribution <strong>of</strong> Holobomolochus divaricatus, new species, H. nudiusculus, new<br />
species, <strong>and</strong> H. asperatus, new species.<br />
FIGURE 97.—Distribution <strong>of</strong> Unicolax collaterals, new species.
150 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
• anonymous<br />
• ciliatus<br />
FIGURE 98.—Distribution <strong>of</strong> Unicolox anonymous (Vervoort) <strong>and</strong> U. ciliatus, new species.<br />
o mycterobius<br />
r • reductus<br />
FIGURE 99.—Distribution <strong>of</strong> Unicolax mycterobius (Vervoort) <strong>and</strong> U. reductus, new species.
NUMBER 3 1 1 151<br />
o C. euthynni<br />
* P. capitulatus<br />
• N. kanagurta<br />
kO.aculeatus<br />
FIGURE 100.—Distribution <strong>of</strong> Ceratacolax euthynni Vervoort, Pumiliopes capitulatus Cressey<br />
<strong>and</strong> Boyle, Nothobomolochus kanagurta Pillai, <strong>and</strong> Orbitacolax aculeatus (Pillai).<br />
FIGURE 101.—Distribution <strong>of</strong> Shiino inauris Cressey <strong>and</strong> S. occlusa Kabata.<br />
o inauns<br />
• occlusa
152 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
• coryphaenae<br />
• regalis<br />
FIGURE 102.—Distribution <strong>of</strong> Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, <strong>and</strong> C. regain<br />
Leigh-Sharpe. (Includes some records <strong>of</strong> Lewis, et al. 1969; Shiino 1959a, 1973; Kabata <strong>and</strong><br />
Gussev, 1966; Pillai, 1963.)<br />
FIGURE 103.—Distribution <strong>of</strong> Caligus productus Muller.<br />
NUMBER 3 1 1 153<br />
o pelamydis<br />
* asymmetricus<br />
FIGURE 104.—Distribution <strong>of</strong> Caligns pelamydis Kroyer, C. asymmetricus Kabata, C. infestans<br />
Heller, <strong>and</strong> C. cybii Bassett-Smith.<br />
o bonito<br />
* omissus<br />
• mutabilis \!<br />
• biseriodentatus ~|<br />
FIGURE 105.—Distribution <strong>of</strong> Caligus bonito Wilson, C. omissus, new species, C. mutabilis<br />
Wilson, <strong>and</strong> C. biseriodentatus Shen.
154<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
o indica<br />
• brachyptera<br />
FIGURE 106.—Distribution <strong>of</strong> Elytrophora indica Shiino, <strong>and</strong> E. brachyptera Gerstaecker.<br />
(Includes Shiino, 1958 <strong>and</strong> 1965 E. indica.)<br />
o buccata<br />
* armatus<br />
• scomberomori -<br />
FIGURE 107.—Distribution <strong>of</strong> Pseudocycnoides buccata (Wilson), P. armatus (Bassett-Smith),<br />
<strong>and</strong> P. scomberomori (Yamaguti).
NUMBER 3 1 1 155<br />
"f 'itf mf 1<br />
* B. thynni<br />
• C. scombri<br />
m B.magna<br />
oC.saba<br />
FIGURE 108.—Distribution <strong>of</strong> Brachiella thynni Cuvier, Clavellisa scombri (Kurz), B. magna<br />
Kabata, <strong>and</strong> Clavellopsis sab a Yamaguti. (Includes Kabata, 1968b B. magna.)
156<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 109.—Holobomolochus divaricatus, new species, female: a, rostral area (1775X)<br />
b, abdomen <strong>and</strong> caudal rami, ventral (540x); c, abdomen, outer distal corner (295OX);<br />
d, labrum (1000X ); e, paragnath (3145X ); /, leg 2 exopod (500X)•
NUMBER 3 1 1 157<br />
FIGURE 110.—Holobomolochus divaricatus, new species, female: a, leg 2 exopod spines (2850);<br />
b, leg 2 endopod first segment (1500X): c, leg 2 armature <strong>of</strong> interpodal plate (3750X);<br />
d, leg 2 (above) <strong>and</strong> leg 3 (below) (200x); e, leg 3 exopod first segment outer spine<br />
(1400X); /, same, lateral view (1315X).
158<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 111.—Holobomolochus divaricatus, new species, female: a, leg 3 exopod first segment<br />
base <strong>of</strong> outer spine (1400X ); b, leg 4 tip <strong>of</strong> endopod (2000X ) ; male: c, abdomen <strong>and</strong> caudal<br />
ramus, ventral (500x); d, caudal ramus outer distal corner (5000X); e, second antenna<br />
(350X); /, hooks on second antenna (3000X).
NUMBER 311 159<br />
FIGURE 112.—Holobomolochus divaricatus, new species, male: a, inner edge <strong>of</strong> maxilliped<br />
(1250X); b, same (3750X); c, leg 1 interpodal plate (2000X); d, leg 1 basipod (1500X);<br />
e, leg 1 exopod third segment (1500X); f, same, outer edge (3000X).
160<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 113.—Holobomolochus divaricatus, new species, male: a, leg 1 exopod third segment<br />
outer edge (5000x). Unicolax collateralis, new species, female: b, cephalon. anterior view<br />
(300x); c, same (900X); d, abdomen <strong>and</strong> caudal rami, ventral (440X); e, tip <strong>of</strong> caudal<br />
ramus, ventral (2000X); /, modified seta <strong>of</strong> first antenna (600X).
NUMBER 311 161<br />
FIGURE 114.—Unicolax collaterally new species, female: a, second antenna (750x); b, hooks<br />
on second antenna (2400x); c, same (2600X); d, labrum (600X); e, oral area (1500X);<br />
/, tip <strong>of</strong> m<strong>and</strong>ible (10,000x)-
162 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 115.—Unicolax collaterals, new species, female: a, tip <strong>of</strong> paragnath (lO.OOOx);<br />
b, leg 2 exopod (lOOOx); c, spines on leg 2 exopod (2000x); d, hyaline fringe <strong>of</strong> leg 2<br />
exopod outer edge (8000X); e, spine on leg 2 exopod (25OOX); /, leg 4 endopod last segment<br />
(1000X).
NUMBER 3 1 1 163<br />
FIGURE 116.—Unicolax collateralis, new species, female: a, tip <strong>of</strong> leg 4 endopod (2000x)-<br />
Unicolax anonymous (Vervoort), female: b, cephalon, anterior view (600x); c, first <strong>and</strong><br />
second antenna, anterior view (700X); d, modified seta <strong>of</strong> first antenna (2300X); t> hooks<br />
on second antenna (75OOX); /, oral area (750X)-
164<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 117.—Unicolax anonymous (Vervoort), female: a, leg 2 exopod (1650X); b, leg 3<br />
exopod outer edge (1750X)- Unicolax mycterobius (Vervoort), female: c, cephalon, anterior<br />
view (200x ) ; d, surface <strong>of</strong> cephalon dorsal to insertion <strong>of</strong> first antennae (1400X ) ; «, cephalon,<br />
anteroventral view (200X ) ; /, modified seta <strong>of</strong> first antenna (400X ).
NUMBER 3 1 1 165<br />
FIGURE 118.—Unicolax mycterobius (Vervoort), female: a, second antenna (750x); b, tip<br />
<strong>of</strong> second antenna (1400X); c, oral area (1050x); d, tip <strong>of</strong> paragnath (5250X); e, leg 1<br />
exopod (500X); /, leg 1 basipod (1000X).
166 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 119.—Unicolax mycterobius (Vervoort), female: a, leg 1 exopod first segment (700X );<br />
b, leg 1 basipod <strong>and</strong> exopod insertion (1050X); c, leg 4 endopod tip (75Ox)- Unicolax<br />
reductus, new species, female: d, distal end <strong>of</strong> caudal rarnus (1500X); e, modified seta <strong>of</strong><br />
first antenna (500x); f, second antenna (lOOOx).
NUMBER 311 167<br />
FIGURE 120.—Unicolax reductus, new species, female: a, oral area (700x); b, paragnath<br />
(3400X); c, leg 2 (260x); d, leg 2 exopod first segment outer corner (2000X); e, leg 2<br />
exopod last segment tip (1200X ); /, leg 2 interpodal plate (1400X).
168 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 121.—Unicolax reductus, new species, female: a, leg 3 (260x); 6, leg 4 endopod first<br />
segment spinules (2000X); c, leg 3 exopod first segment (1000X); d, leg 3 exopod first<br />
segment spinules (5000X ); e, leg 4 (240X ); /, leg 4 exopod (650x )•
NUMBER 311 169<br />
FIGURE 122.—Unicolax reductus, new species, female: a, leg 4 exopod second segment outer<br />
corner (1200X); b, leg 4 endopod tip (1600X). Ceratacolax euthynni Vervoort, female:<br />
c, cephalon, anterolateral view (230X); d. same, oblique view (185X); e, same, anterior<br />
view (200X); /, rostrum (600X).
170 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 123.—Ceratacolax euthynni Vervoort, female: a, rostrum detail (2280x)- b posterior<br />
corner <strong>of</strong> genital segment (260X ) ; c, same, lateral view (370X); d, abdomen <strong>and</strong> caudal<br />
rami, ventral (300X ) ; e, caudal ramus, ventral (500X); /, caudal ramus posterior corner<br />
ventral (5000X).
NUMBER 311 171<br />
FIGURE 124.—Ceratacolax euthynni Vervoort, female: a, base <strong>of</strong> modified seta on first antenna,<br />
rostrum on left (420 X ) ; b, second antenna, distal half (1000X ) ; c, hooks on second antenna<br />
(5000X); d, terminal seta <strong>of</strong> second antenna (4000X): e, oral area (400X ); /, oral area,<br />
detail (650X).
172<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 125.—Ceratacolax euthynni Vervoort, female: a, tip <strong>of</strong> m<strong>and</strong>ible <strong>and</strong> paragnath<br />
(1350X ) ; b, detail <strong>of</strong> second maxilla terminal flagellum (2000X ) ; c, maxilliped claw (900X ) :<br />
d, fringe <strong>of</strong> leg 1 endopod (1900X ) ; e, leg 2 exopod outer edge (800X); f, leg 5 lateral spine<br />
(750X).
NUMBER 311<br />
FIGURE 126.—Pumiliopes capitulatus Cressey <strong>and</strong> Boyle, female: a, spinules on abdomen,<br />
ventral (2800 X ) ; b, oral area (300 X ) ; c, flagellum <strong>of</strong> second maxilla <strong>and</strong> labium below<br />
(2000X)- Shiinoa occlusa Kabata, female: d, rostral area, anterior view (100x); e, rostrum<br />
above <strong>and</strong> second antenna below, lateral view (75 X ) ; /, detail <strong>of</strong> pores on rostrum <strong>and</strong> second<br />
antenna, lateral view (280X)-<br />
173
174 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 127.—Shiinoa occlusa Kabata, female: a, tip <strong>of</strong> second antenna <strong>and</strong> first antenna<br />
(200X); b, base <strong>of</strong> first antenna (500x); c, oral area <strong>and</strong> legs 1 <strong>and</strong> 2 (90x); d, leg 1<br />
(660x); e, leg 2 (440X); /, legs 3 (180x).
NUMBER 311 175<br />
FIGURE 128.—Shiinoa occlusa Kabata, female: a, tip <strong>of</strong> genital segment, abdomen, <strong>and</strong> caudal<br />
rami, lateral view (70x); b, detail <strong>of</strong> genital area (240x)- Caligus coryphaenae Steenstrup<br />
<strong>and</strong> Liitken, female: c, cephalon, ventral (30x ) ; d, frontal lunule (200X ) ; e, second antenna<br />
(200X); f, a happy mouth tube (280X ).
176 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 129.—Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, female: a, tip <strong>of</strong> mouth tube,<br />
labrum above (550 X ); b, leg 1 (150 X ) ; c, tip <strong>of</strong> leg 1 exopod (500x) ; d, midterminal spine<br />
on leg 1 exopod (1300X); e, fringe at base <strong>of</strong> midterminal spine on leg 1 exopod (2800x);<br />
/, plumosities on leg 1 lateral seta (1300x)-
NUMBER 3 1 1 177<br />
FIGURE 130.—Caligus coryphaenae Steenstrup <strong>and</strong> Liitken, female: a, leg 2 exopod (26OX);<br />
b, spine on leg 2 first segment (650X ) ; c, spinules on outer edge <strong>of</strong> leg 2 endopod (1000X ) ;<br />
d, tip <strong>of</strong> leg 4 (290 X ) ; e, spine on leg 4 second segment (600 X ); /, fringe at base <strong>of</strong> terminal<br />
seta on leg 4 (1200 X ).
178 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 131.—Pseudocycnus appendiculatus Heller, female: a, cephalon, anterior view (55x);<br />
b, same, between bases <strong>of</strong> first antennae (300X ) ; c, anal opening (240X ) ; d, same (373x) ;<br />
*, second antenna (105 X ); /, second maxilla (500X ) •
NUMBER 311 179<br />
FIGURE 132.—Pseudocycnus appendiculatus Heller, female: a, maxilliped (200X); b, tip <strong>of</strong><br />
maxilliped (500X ) ; c, leg 1 (420X ) ; d, leg 1 exopod base <strong>of</strong> terminal spine (1800X ); ', leg<br />
1 endopod (75OX ) ; /, same, lateral view (800x)-
180 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
*——<br />
p^ - ' £<br />
1<br />
•<br />
i K i<br />
FIGURE 133.—Pseudocycnus appendiculatus Heller, female: a, leg 2 (125X ) ; b, same (500X) ;<br />
c, leg 3 (400X); rf, tip <strong>of</strong> leg 3 (1200X); male: e, genital segment, ventral (150X);<br />
/, spinules on genital segment, ventral (5000X).<br />
D
NUMBER 311<br />
FIGURE 134.—Pseudocycnus appendiculatus Heller, male: a, caudal ramus, ventral (200X)<br />
b, spinules on caudal ramus (2000X ) ; c, mouth tube (400X ) ; d, tip <strong>of</strong> mouth tube (2000X )<br />
e, first maxilla (400 X ); /, base <strong>of</strong> maxilliped (500X ).<br />
181
182 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 135.—Pseudocycnus appendiculatus Heller, male: a, leg 1 (400x); b, leg 1 exopod<br />
(2000X); c, leg 1 endopod (4000X); d, leg 2 (400X); e, spinules on 'leg 2 basipod<br />
(5500X); /, leg 3 (625X).
NUMBER 311 183<br />
FIGURE 136.—Pseudocycnus appendiculatus Heller, male: a, base <strong>of</strong> leg 5 (5000X)- Pseudocycnoides<br />
armatus (Bassett-Smith), male: b, spinules on genital segment (6550X ) ; c, abdomen<br />
<strong>and</strong> caudal rami, ventral (250X); d, caudal ramus, ventral (750x); e, tip <strong>of</strong> caudal ramus,<br />
ventral (1600x ); /, leg 1 (500X ).
184 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />
FIGURE 137.—Pseudocycnoides armatus (Bassett-Smith), male: a, legs 2 <strong>and</strong> 3 (500x);<br />
b, leg 2 tip <strong>of</strong> exopod (3100 X ); c, leg 2 tip <strong>of</strong> endopod (2000X ) ; d, leg 2 endopod spinules<br />
(7000X ) ; e, leg 2 exopod tip <strong>and</strong> leg 3 (1050X ) ; /, tip <strong>of</strong> leg 3 (5250X )•
NUMBER 311 185<br />
FIGURE 138.—Pseudocycnoides buccata (Wilson), female: a, cephalon, ventral (75X);<br />
b, second antenna (37OX); c, mouth tube (600x); d, tip <strong>of</strong> mouth tube (2500X); e, first<br />
maxilla (1250X); /, tip <strong>of</strong> second maxilla (1450X).
186<br />
FIGURE 139.—Pseudocycnoid.es buccata (Wilson), female:<br />
a, tip <strong>of</strong> second maxilla (1225X); b, same (1450x); c,<br />
same (4400X).<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
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