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Journal of Natural History
ISSN: 0022-2933 (Print) 1464-5262 (Online) Journal homepage: http://www.tandfonline.com/loi/tnah20
A new genus and two new species of Argeiinae
(Crustacea: Isopoda: Bopyridae) from the Indo-
west Pacific
Jianmei An, Pengchi Zhang & Gustav Paulay
To cite this article: Jianmei An, Pengchi Zhang & Gustav Paulay (2017): A new genus and two
new species of Argeiinae (Crustacea: Isopoda: Bopyridae) from the Indo-west Pacific, Journal of
Natural History
To link to this article: http://dx.doi.org/10.1080/00222933.2016.1270362
Published online: 08 Jan 2017.
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A new genus and two new species of Argeiinae (Crustacea:
Isopoda: Bopyridae) from the Indo-west Pacific
Jianmei An
a
, Pengchi Zhang
a
and Gustav Paulay
b
a
School of Life Science, Shanxi Normal University, Linfen, China;
b
Florida Museum of Natural History,
University of Florida, Gainesville, FL, USA
ABSTRACT
Three hosts from Indo-west Pacific including Kiribati, Guam
Island and Australia were examined, and found to be infested
by three species of the subfamily Argeiinae. We describe
Paraeragia kiribatiensis gen. nov., sp. nov. from Kiribati infest-
ing Synalpheus gracilirostris. The new genus is most related to
Eragia anditcanbedistinguishedbyfemalewithtriangular
pleon, lateral plates extend posteriorly, paired uropods, widely
opened brood pouch. Argeiopsis guamensis sp. nov. from Guam
Island infesting Synalpheus cf. stimpsoni. The new species is
most similar to Argeiopsis inhacae but differs in female with
curved posterior margin of first oostegite, partly fused pleo-
meres, and male with head separated from first pereomere,
pleon as wide as seventh pereomere. We also record
Stegoalpheon kempi from Australia for the first time, infesting
Alpheus cf. perplexus. Keys to the nine genera of Argeiinae, and
to three species of Argeiopsis are provided. A table for all 13
species of Argeiinae with localities and host records is also
provided. A table comparing the distribution of lateral plates
and morphology of pleopods and uropods among argeiine
genera is presented.
http://www.zoobank/urn:lsid:zoobank.org:pub:284AB32C-6AE5-45BC-9C5D-01B3030D6DE6
ARTICLE HISTORY
Received 13 June 2016
Accepted 28 November 2016
KEYWORDS
Bopyridae; Argeiinae; new
genus; new species;
biodiversity
Introduction
The bopyrid subfamily Argeiinae Markham, 1977 is presently comprised of eight
genera and eleven species, all parasitizing caridean and stenopodidean shrimp.
Examination of hosts in the collections of the Florida Museum of Natural History,
University of Florida, revealed three caridean specimens that were infested by
argeiine bopyrids, each represents a different species. Two of these species are
new, and one represents a new genus as well.
Markham (1977) erected the bopyrid subfamily Argeiinae based on five genera
(Argeia Dana, 1853;Argeiopsis Kensley, 1974;Bopyrosa Nierstrasz & Brender à Brandis,
1923;Parargeia Hansen, 1897;Stegoalpheon Chopra, 1923) with species found infest-
ing shrimp species from the family Crangonidae, Alpheus, Eualus and Stenopus.
CONTACT Jianmei An anjianmei@hotmail.com
JOURNAL OF NATURAL HISTORY, 2017
http://dx.doi.org/10.1080/00222933.2016.1270362
© 2017 Informa UK Limited, trading as Taylor & Francis Group
Bourdon and Bruce (1983) added Gareia, characterized by a fused pleon, with the
type species infesting Pseudathanas darwiniensis (Alpheidae) from Australia.
Markham (1994)describedEragia with the type species based on a female specimen
with a quadrate pleon, infesting Prionocrangon paucispina (Crangonidae) from New
Caledonia. Williams and Boyko (2010) described the male of Eragia profunda
Markham, 1994, and discussed relationships in the subfamily Argeiinae. An et al.
(2015) erected the new genus Stegoargeia for Argeia lowisi Chopra, 1923 and Argeia
nierstraszi Shiino, 1958, and reviewed the subfamily Argeiinae.
These eight genera, with eleven species, currently constitute the Argeiinae (Boyko
and Schotte 2016). Although the validity of the Argeiinae has been the subject of
discussion (Adkison et al. 1982; Trilles 1999; Boyko and Kazmi 2005), it is difficult to
place these genera into any other subfamily. Evaluation of the subfamilial classification
of bopyrids awaits phylogenetic analysis, although Boyko et al. (2013) derive a phylo-
geny of epicaridean taxa based on 18S rDNA.
The lateral plates of the pleomeres are confused in the Argeiinae. Chopra (1923)
pointed out that lateral plates are absent in Stegoargeia lowisi but the outer rami of the
pleopods are placed so close to the margins that they superficially appear to be lateral
plates. Shiino (1958) confirmed the absence of lateral plates in Stegoargeia lowisi and
also in Stegoargeia nierstraszi (Shiino, 1958), and noted that both had biramous pleo-
pods. Markham (1977) summarized the subfamily and gave the diagnosis of five genera,
and thought all five had lateral plates and uniramous pleopods. However, Adkison et al.
(1982) argued that Argeiopsis lacks lateral plates and has biramous pleopods. An et al.
(2015) further confirmed this. Given the confusion surrounding lateral plates of bopyrids,
it is important to define this feature. In female bopyrids, the lateral plates are lateral
extensions of the pleon; contiguous with it and without any articulation. The pleopods
may also extend laterally, but are separated from the pleon by a clear articulation.
Table 1 summarizes the distribution of lateral plates and the nature of pleopods and
uropods across the Argeiinae.
Examination of decapod specimens deposited in the Florida Museum of Natural
History, University of Florida (UF) led to the finding of a new genus and two new species
of argeiine bopyrids parasitizing three shrimp specimens, and these are described
below. The hosts and distribution of the 13 species of Argeiinae now known are
summarized in Table 2.
Table 1. Characters of females in the nine genera of Argeiinae.
Genus Lateral plates Pleopods Uropods
Argeia Dana, 1853 √Biramous Uniramous
Argeiopsis Kensley, 1974 × Biramous Biramous
Bopyrosa Nierstrasz & Brender à Brandis, 1923 √Uniramous Uniramous
Eragia Markham, 1994 √Uniramous Uniramous
Gareia Bourdon & Bruce, 1983 × Biramous Uniramous
Paraeragia gen. nov. √Uniramous Uniramous
Parargeia Hansen, 1897 × Biramous Uniramous
Stegoalpheon Chopra, 1923 √Biramous Uniramous
Stegoargeia An, Boyko & Li, 2015 × Biramous Uniramous
2J. AN ET AL.
Table 2. Localities and hosts of 13 species of Argeiinae Markham, 1977.
Species Type host and localities Other hosts and localities
Argeia pugettensis Metacrangon munita (Washington) Argis alaskensis (Washington; California)
Argis crassa (Rathbun) (California)
Argis dentata (Rathbun) (California; Washington)
Argis lar (Owen) (Japan; California; Korea)
Argis ovifer (Rathbun) (California)
Argis spp. (Kamchatka Peninsula and Bering Sea)
Crangon affinis De Haan, 1849 (Japan; China)
Crangon alaskensis Lockington (California;
Washington)
Crangon alba Holmes (California)
Crangon cassiope de Man (China)
Crangon crangon (Linnaeus) (China)
Crangon dalli Rathbun (California)
Crangon franciscorum franciscorum Stimpson
(California; Washington)
Crangon nigromaculata Lockington (California)
Crangon propinquus Stimpson (Japan; California)
Crangon spp. (Kamchatka Peninsula and Bering Sea)
Eualus suckleyi (Stimpson) (Washington)
Lissocrangon stylirostris (Holmes) (British Columbia;
Oregon)
Mesocrangon munitella (Walker) (Washington)
Metacrangon munita (Dana) (British Columbia;
California; Washington)
Neocrangon communis (Rathbun) (California;
Washington)
Neocrangon sagamiensis (Balss) (Japan;)
Neocrangon resima (Rathbun) (Washington)
Argeia atlantica Markham, 1977 Metacrangon jacqueti (A. Milne-Edwards) (Bahamas) -
Argeiopsis inhacae Kensley, 1974 Stenopus hispidus (Olivier) (Mozambique) Stenopus hispidus (Olivier) (Philippines)
Argeiopsis kensleyi Boyko & Kazmi, 2005 Microprosthema validum Stimpson (Pakistan) -
Argeiopsis guamensis n.sp. Synalpheus prox. stimpsonii (de Man) (Guam Island) -
Bopyrosa phryxiformis Nierstrasz & Brender
à Brandis, 1923
Unknown host (Philippines) -
Eragia profunda Markham, 1994 Prionocrangon sp. (New Caledonia) -
Gareia arafurae Bourdon & Bruce, 1983 Pseudathanas darwiniensis Bruce (Australia) -
Paraeragia kiribatiensis sp. nov. Alpheus sp. (Line Islands) -
Parargeia ornata Hansen, 1897 Metacrangon procax (Faxon) (Mexico) -
(Continued)
JOURNAL OF NATURAL HISTORY 3
Table2. (Continued).
Species Type host and localities Other hosts and localities
Stegoalpheon kempi Chopra, 1923 Alpheus prox. lobidens De Haan, 1849 Alpheus rapax Fabricius (Japan)
Alpheus sp. (India; China)
Alpheus malabaricus (Fabricius) (India)
Alpheus paludicola Kemp (India)
Stegoargeia lowisi (Chopra, 1923)Alpheus prox. euphrosyne de Man (Andaman Islands, Bay of Bengal) Alpheus rapax Fabricius (Japan)
Alpheus brevirostris (Olivier) (Japan)
Stegoargeia nierstraszi (Shiino, 1958)Alpheus bisincisus De Haan, 1849 (Japan) Alpheus sp. (Indonesia)
4J. AN ET AL.
Key to nine genera of Argeiinae based on females
1. Pleon with lateral plates.................................................................................................................... 2
Pleon without lateral plates............................................................................................................. 6
2. Pleopods biramous ............................................................................................................................ 3
Pleopods uniramous ........................................................................................................................... 4
3. Body broader than long ............................................................. Stegoalpheon (one species)
Body longer than broad ............................................................................ Argeia (two species)
4. Pereon much wider than pleon; .................................................................................................. 5
Pereon about as wide as pleon ........................................................ Bopyrosa (one species)
5. Pleon quadrate, about as long as pereon ......................................... Eragia (one species)
Pleon triangular, much shorter than pereon ................................... Paraeragia gen. nov.
6. Uniramous uropods............................................................................................................................. 7
Biramous uropods................................................................................ Argeiopsis (three species)
7. Pleon fused ....................................................................................................... Gareia (one species)
Pleomeres distinct................................................................................................................................ 8
8. Brood pouch closed, maxilliped with articulated palp ............ Parargeia (one species)
Brood pouch widely open, maxilliped without palp or with non-articulated
palp ........................................................................................................... Stegoargeia (two species)
Material and methods
All materials examined are deposited in the Florida Museum of Natural History,
University of Florida (UF). Bopyrids were viewed and drawn using a LEICA MZ16 stereo-
microscope, the figures were scanned using a CanonScan 9900F, and edited using
Adobe Photoshop CS6.
Systematics
Order ISOPODA Latreille, 1817
Suborder CYMOTHOIDA Wägele, 1989
Family BOPYRIDAE Rafinesque-Schmaltz, 1815
Subfamily Argeiinae Markham, 1977
Paraeragia gen. nov.
Diagnosis
Female.Body distorted. Head quadrate, without frontal lamina, extending into a distorted
pereomere 1; maxilliped with setose palp. Pereon broader than long; with reduced coxal
plates on pereomeres; first oostegite with nearly smooth ridge. Pleon of six separate
pleomeres; first five with lateral plates and uniramous pleopods; uropods uniramous.
Male.Head oblong, with dark eyes. All seven pereomeres of equal width; first two
pereopods with much larger dactyli than subsequent pereopods. Pleonal segments
fused; pleopods absent.
JOURNAL OF NATURAL HISTORY 5
Etymology.Paraeragia is derived from the name of the most similar genus, Eragia.
Gender feminine.
Type species: Paraeragia kiribatiensis gen. nov., sp. nov., by present designation.
Paraeragia kiribatiensis gen. nov., sp. nov.
(Figures 1 and 2)
Material examined
UF Arthropoda 42226: holotype ♀, allotype ♂, infesting Synalpheus gracilirostris de Man,
1910 (UF Arthropoda 40882); Kiribati, Line Islands, Millennium Island, ‘tent site’,12m,
host in live Pocillopora, 9.91° S, 150.21° W. 5 November 2013, coll., Francois Michonneau,
Matthieu Leray, Nancy Knowlton.
Figure 1. Paraeragia kiribatiensis sp. nov. Holotype female: (a) Dorsal view. (b) Ventral view. (c) Right
antenna and antennule. (d) Right barbula. (e) Right maxilliped, external view. (f) Palp of right
maxilliped. (g) Right oostegite 1, external view. (h) Right oostegite 1, internal view. (i) Left pereopod
1. (j) Left pereopod 7. Scale = 1 mm (a, b), 0.34 mm (c, f, i, j), 0.54 mm (d, e, g, h).
6J. AN ET AL.
Description of holotype female (Figure 1)
Length 2.62 mm, maximum width 2.54 mm, head length 0.58 mm, head width
0.84 mm. Body outline oval, slightly distorted (Figure 1(a,bHead quadrate, without
frontal lamina, extending into pereomere 1 (Figure 1(a)). Black eyes on the anterolateral
corners of the head (Figure 1(a)). Antennule of three articles; antenna of four articles;
terminal article of antennules and antenna setose (Figure 1(c)). Barbula with two blunt
lateral projections on each side, flat near centre (Figure 1(d)). Maxilliped triangular,
articulated, with setose palp (Figure 1(e,f)).
Pereon broadest across third pereomere (Figure 3(a)). Pereomeres mostly distinct, per-
eomeres2and3fusedontheirleftside(Figure 1(a)). Pereon wider than long, with reduced
coxal plates on firstfourpereomeresontheleftsideandonthefirst three pereomeres on
the right side (Figure 1(a)). Round tergal projection present only on the right side of
pereomeres 2 and 3. Brood pouch widely open (Figure 1(b)). First oostegite with nearly
Figure 2. Paraeragia kiribatiensis sp. nov. Allotype male: (a) Dorsal view. (b) Ventral view. (c) Right
antenna and antennule. (d) Left pereopod 1. (e) Left pereopod 3. (f) Left pereopod 7. Scale = 1 mm
(a, b), 0.70 mm (c, d, e, f).
JOURNAL OF NATURAL HISTORY 7
smooth ridge and round posterolateral point (Figure 1(g,h)), and posterior margin of the first
oostegite also smooth. Pereopods slightly larger posteriorly (Figure 1(i,j)), with blunt dactyli.
Pleon of six pleomeres, first five bearing lateral plates and small uniramous pleopods
(Figure 1(b)). Uropods resembling lateral plates, uniramous.
Description of allotype male (Figure 2)
Figure 3. Argeiopsis guamensis sp. nov. Holotype female: (a) Dorsal view. (b) Ventral view. (c) Right
antenna and antennule. (d) Right side of barbula. (e) Right maxilliped, external view. (f) Right
oostegite 1, external view. (g) Right oostegite 1, internal view. (h) Left pereopod 1. (i) Left pereopod
7. (j) Ventral view of pleon (endopodites shaded). Scale = 1 mm (a, b), 0.18 mm (c, h, i), 0.39 mm (d),
0.32 mm (e, f, g), 0.40 mm (j).
8J. AN ET AL.
Length 1.40 mm, maximum width, across pereomere 3, 0.52 mm, head length
0.24 mm, head width 0.42 mm, pleonal length 0.26 mm. With scattered black pigmenta-
tion on dorsal surface of pereon and pleon.
Head oblong, black eyes near posterior margin (Figure 2(a)). Antennae extending
beyond head, visible in dorsal view. Antennule of three articles, antennae of five or six
articles, terminal articles of antennules and antennae setose (Figure 2(c)).
All pereon segments distinct (Figure 2(a)), pereomere sides parallel, subequal in
width, lacking midventral projections (Figure 2(b)). First pereopods with longest dactyli,
second pereopods with second largest dactyli, all seven pereopods with sharp, pointed
dactyli (Figure 2(d–f)). Carpi increasing in size posteriorly (Figure 2(d–f)).
Pleon fused into single piece, but with faint lines suggesting demarcation of first
three segments on dorsal surface (Figure 2(a)). Pleopods and uropods absent.
Etymology
The specific name, kiribatiensis refers to the type locality of Kiribati, Line Islands.
Remarks
These specimens are placed in Argeiinae because the female has a round body outline, a
head without frontal lamina, a brood pouch that is widely open, a first oostegite with a
simple internal ridge, and a pleon with six distinct pleomeres, whereas the male has a fused
pleon. Among the eight currently recognized argininegenera, four have lateral plates on the
pleon (Argeia,Bopyrosa, Eragia,Stegoalpheon), and four lack them (Argeiopsis,Gareia,
Parargeia,Stegoargeia). Paraeragia has prominent lateral plates, but the uniramous pleo-
pods and uropods distinguish it from Argeia and Stegoalpheon. Paraeragia differs from
Eragia (based on Markham 1994; Williams and Boyko 2010) in the following characters
(character states in Eragia given in parentheses): female: (1) triangular pleon, much shorter
than pereon (quadrate pleon, pereon and pleon of equal length); (2) lateral plates extend
posteriorly (extend laterally); (3) uropods paired, (uropods absent or present on right side
only); (4) brood pouch widely open, (brood pouch almost closed); (5) oostegite 1 with blunt
and round posterolateral point (with very slender and pointed posterolateral point); male:
(1) faint lines demarcate anterior segments of pleon (pleon entire) (unique of species in the
subfamily); (2) with black eyes (lacking eyes); (3) antennae with three articles (seven articles);
(4) antennule with four articles (three articles); (5) pereopods decreasing in size from anterior
to posterior (increasing in size); (6) body dorsally pigmented (unpigmented). Paraeragia
differs from Bopyrosa in: (1) body about as long as wide (much longer than wide); (2) pleon
much narrower than the pereon (wider than pereon because of large lateral plates); (3)
lateral plates not conspicuously extended (markedly extended).
Genus Argeiopsis Kensley, 1974
Type species: Argeiopsis inhacae Kensley, 1974, by monotypy
Argeiopsis guamensis sp. nov.
(Figures 3 and 4)
JOURNAL OF NATURAL HISTORY 9
Material examined
UF Arthropoda 42224: holotype ♀, allotype ♂, infesting Synalpheus cf. stimpsonii (de
Man, 1888) (UF Arthropoda 2135); Mariana Islands, Guam Island, Tumon, Gun Beach, fore
reef, 13.5° N, 144.8° E, host commensal on the crinoid Phanogenia gracilis, 30 m, 1 June
2000, coll. Lisa Kirkendale.
Description of holotype female (Figure 3)
Length 4.23 mm, maximum width 3.84 mm, head length 0.77 mm, head width
1.08 mm. Body outline triangular, almost symmetrical (Figure 3(a,b)).
Head quadrate with short frontal lamina, wider than long. Black eyes on the boundary
between head and frontal lamina (Figure 3(a)). Antennule of two articles; antenna of
three articles; both with broad, bulging bases and with setose terminal articles (Figure 3
(c)). Barbula with two pairs of falcate lateral projections on each side, flat near centre
(Figure 3(d)). Maxilliped articulated, with setose palp (Figure 3(e)).
Figure 4. Argeiopsis guamensis sp. nov. Allotype male: (a) Dorsal view. (b) Ventral view. (c) Left antenna
and antennule. (d) Left pereopod 1. (e) Left pereopod 4. Scale = 1 mm (a, b), 0.29 mm (c, d, e).
10 J. AN ET AL.
Pereon broadest across third pereomere (Figure 3(a)). Small coxal plates on first four
pereomeres on right, and on first two pereomeres on left (Figure 3(a)). Dorsolateral
bosses on first four pereomeres on both sides, but tergal projections only on second and
third right pereomeres. Brood pouch widely open (Figure 3(b)). First oostegite (Figure 3
(f,g)) with two articles subequal in length; posterolateral point of distal segment
rounded; internal ridge almost unornamented, except for a conspicuous incision.
Pereopods increasing in size posteriorly (Figure 3(h,i)); bases of first three pereopods
with lobes along flexor margins.
Pleon of six pleomeres; first five pleomeres clearly demarcated on right side but only
faintly demarcated on left. Lateral plates absent. Five biramous, unequal pleopods
present, exopodites much larger than endopodites (Figure 3(b,j)). Endopodite of first
pleopod globose, others plate-like; left pleopods much larger than those on right. Sixth
pleomere with biramous uropods, also with much larger exopodite than endopodite.
Description of allotype male (Figure 4)
Length 2.56 mm, maximum width, across pleon 5, 1.06 mm, head length 0.43 mm,
head width 0.71 mm, pleonal length 0.63 mm.
Head oblong, with triangular posterior margin (Figure 4(a)). Small black eyes close to
posterior margin (Figure 4(a)). Antennule of three articles, bases stout, distal article setose.
Antennae of three articles, bases slender, terminal two articles setose (Figure 4(b,c)).
All pereon segments distinct. First four pereomeres subequal in width, lacking mid-
ventral projections (Figure 4(b)). First pereopods each with much larger dactylus and
much shorter carpus than those of other six. Posterior six pereopod pairs subequal in
size and structure (Figure 4(d,e)). All propodi and carpi with setae on inner surface
(Figure 4(d,e)).
Pleon fused into a single piece; only first pleomere of left side discernible from sharp
marginal angle (Figure 4(a)). Anal cone on the ventral surface near the posterior margin
of pleon (Figure 4(b)).
Etymology
The specific name guamensis refers to the type locality of Guam Island.
Remarks
As with the other two species of Argeiopsis, females of the new species have biramous
pleopods and uropods, lacking lateral plates, and have a widely open brood pouch,
whereas males have fused pleons. Based on the descriptions given by Kensley (1974)
and Adkison et al. (1982), the new species is most similar to Argeiopsis inhacae Kensley,
1974,butdiffers in the following characters (character states in A. inhacae given in
parentheses): female: (1) first oostegite with curved posterior margin, posterolateral
point rounded, extending posteriorly, (with straight posterior margin, posterolateral
point somewhat pointed, extending laterally); (2) pleomeres partly fused, (pleomeres
distinct); male: (1) head separated from first pereomere (fused with first pereomere); (2)
pleon nearly as wide as seventh pereomere (pleon much narrower than seventh
pereomere).
The new species can be distinguished from Argeiopsis kensleyi Boyko & Kazmi, 2005
by the structure of the first oostegite, maxilliped, and barbula of the female. In the
female of A. kensleyi a posterolateral point is absent on the first oostegite, the maxilliped
JOURNAL OF NATURAL HISTORY 11
palp lacks setae, and the barbula has one pair of projections on each side (Boyko and
Kazmi 2005).
The host, Synalpheus stimpsonii (de Man, 1888), is known to be part of a species
complex that has not yet been revised (Hultgren et al. 2014).
Key to species of Argeiopsis
1. First oostegite without posterolateral point, maxilliped with curved, non-setose
palp........................................................................................................................................... A. kensleyi
First oostegite with posterolateral point, maxilliped with long setose palp ............. 2
2. Posterolateral point of first oostegite directed laterally .................................. A. inhacae
Posterolateral point of first oostegite directed posteriorly....... A. guamensis sp. nov.
Stegoalpheon kempi Chopra, 1923
(Figures 5 and 6)
Stegoalpheon kempi Chopra, 1923: 462, 464–467, text fig. 8, pl. 13, fig. 1–7[India,
infesting Alpheus cf. lobidens]; Shiino, 1951:26–29, figs 1–2[Japan,infesting
Alpheus rapax]; Pillai, 1954: 20; Pillai, 1966: 188–190, figs 12–20 [India, infesting
Alpheus sp.]; Shiino, 1958: 61 [Japan, infesting Alpheus rapax]; Rao & Ramaprasad,
1964: 588–589, figs 1–2 [India, infesting Alpheus malabaricus]; Shiino, 1972:8;
Kannupandi, 1976:87–93, figs 1–3; Markham, 1977: 109–111, 119–120; Adkison
et al., 1982: 337; Kensley, 2001: 226; An, 2006:65–65, fig. 27; An et al., 2008:
225–226, fig. 2 [China, infesting Alpheus sp.]; Liu, 2008: 693; Williams & Boyko,
2010: 150; An, 2011: 134–136, figs 5-5-5-7 [same material as An et al., 2008]; An
et al., 2015:20–22, fig. 3.
Stegoalpheon choprai Pillai, 1954: 20 [India, infesting Alpheus paludicola]; Rao &
Ramaprasand, 1964: 588; Markham, 1977: 109, 111, 120; Kensley, 2001: 226;
Williams & Boyko, 2010: 150.
Stegoalpheen [sic]kempi –Rao & Ramaprasand, 1964: 588 (figure caption).
Material examined
UF Arthropoda 42225, 1♀,1♂,infestingAlpheus cf. perplexus.(UFArthropoda
27567). Australia, Western Australia, Ningaloo reef, Norwegian Bommies, 5–6m,
22.6206° S, 113.6424° E; 27 May, 2010, coll., Slava Ivanenko, Arthur Anker.
Remarks
Chopra (1923) erected the genus Stegoalpheon for S. kempi, based on females with five
pairs of triramous pleopods: with two ventral rami and a third ramus arising dorsally in
the form of a vertical ridge. Shiino (1951,1958) recorded S. kempi from Japan, and
suggested that the triramous pleopods described by Chopra (1923) should be reinter-
preted as biramous, with the dorsal ramus representing a lateral plate. Pillai (1954)
provided a very brief description of S. choprai and later (Pillai 1966) relegated it into
synonymy with S. kempi.
12 J. AN ET AL.
The present specimens extend the range of this species from India, the Andaman
Islands and Japan, to Western Australia. The Australian specimens conform well with
Chopra’s(1923) description (Figure 5(a,b)) with a similar first oostegite (Figure 5(e,f)), and
in the overall morphology of the male (Figure 6). However, they show some minor
differences: (1) barbula (Figure 5(c)) with two pairs of small projections on each side,
versus specimens of Shiino (1951) with four pairs, and of Chopra (1923) with two pairs of
triangular projections; (2) maxilliped (Figure 5(d)) with a short palp having a ciliated
margin, versus specimens of Chopra (1923) and Shiino (1951) with maxilliped lacking a
Figure 5. Stegoalpheon kempi Chopra, 1923. Female: (a) Dorsal view. (b) Ventral view. (c) Right side
of barbula. (d) Left maxilliped, external view. (e) Right oostegite 1, external view. (f) Right oostegite
1, internal view. (g) Left pereopod 1. (h) Left pereopod 7. (i) Ventral view of pleon (endopodites
shaded). Scale = 1 mm (a, b), 0.42 mm (c, e, f, i), 0.26 mm (d), 0.14 mm (g, h).
JOURNAL OF NATURAL HISTORY 13
palp. (3) endopodites (Figure 5(i) much smaller than respective exopodites, whereas
described specimens (Chopra 1923; Shiino 1951; Pillai 1966) had subequal exopodites
and endopodites. These differences are probably the result of different degrees of
maturity of the studied specimens.
Acknowledgements
We are indebted to all collectors of the specimens in the Florida Museum of Natural History. We
also wish to thank Mandy Bemis and John Slapcinsky of the Florida Museum of Natural History for
all the help during the first author’s visit.
Figure 6. Stegoalpheon kempi Chopra, 1923. Male: (a) Dorsal view. (b) Ventral view. (c) Left antenna
and antennule. (d) Right pereopod 1. (e) Right pereopod 2. (f) Right pereopod 3. (g) Right pereopod
7. Scale = 1 mm (a, b), 0.55 mm (c, d, e, f, g).
14 J. AN ET AL.
Disclosure statement
No potential conflict of interest was reported by the authors.
Funding
This work was supported by the National Natural Science Foundation of China [31471970];
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