Bull. Mar. Sci. Fish., Kochi Univ. No. 22, pp. 81-87, 2003 A new species of Joeropsis (Isopoda, Asellota, Joeropsidae) from a Sabellid reef in Pakistani waters (northern Arabian Sea) Quddusi B. Kazmii, and FarzanaYousuf2 iMarine Reference Colleetion andResource Centre, University ofKarachi, Karaehi-75270, Pakistan, 2DePaltment ofZoology, University ofKaraehi, Karachi-75270, Pakistan. Abstract: This paper describes a new microscopic isopod species belonging to the asellotan genusfoeropsis. The holotype was collected alive from a polychaete colony in the intertidal region of Sandspit, Karachi. [lhe species can be diagnosed on the basis of the following characters: a dome-shaped rostrum, a lightly armed pleotelson, having a submarginal setose ridge; an extended maxilliped basis and a cephalon coverecl with dark pigrnent in patches, The species will also be the first asellotan representative from Pakistan coast. Key words: New species,loeroPsis, Isopoda, Pakistan, Introduction The suborder Asellota Latreille, 1803 is one of the most diverse groups ofisopods, comprising about 25 O/o of all the marine species. Members of the family Joeropsidae Nordenstam, 1933 have been known from all the continents and oceans. Nevertheless no report of any asellote has been published from Pakistan. This paper describes new species of the genusJoeroPsis, and also represents the .first record for the suborder from our area. The holotype is housed in the repository of Marine Reference Collection & Resource Centre (MRC) , University of Karachi. Joeropsis karachiensis sp. nov. (Figs. 1-4) Diagnosis : The species can be diagnosed on the basis of the following characters : a dome-shaped rostrum, a lightly armed pleotelson, having a submarginal setose ridge, an extended maxilliped basis and a cephalon covered with dark pigment in patches. Material: Holotype MRC Cat. No. ISO 10, male, Sandspit, Karachi, 26th March, 1999 from a polychaete colony (Sabellaria sPinulosa) at low tide. Description : Total length 3.0 mm, body (Fig. 2A) parallel-sided, about 4 times longer than wide. Half of dorsal surface of head covered with dark pigment patch (Fig. IA) ; lateral surface of almost all pereonites with small dark pigment spots. Antero-lateral angles of cephalon not very acute; 81 Quddusi B. Kazmi, Farzana Yousuf 82 g.ts-'', si •- is" ' ': dinyt'' 6. js' s. . •si•• "" ' .i. .!'A 3l,,}ti/IIIIS!1N ';'i-e $ k. ' S ]Nkes SiLS4• Fig. 1. A, loeroPsis learachiensis sp. nov. photograph of live specimen. B, Sabellid reef; B', same, magnified. <ilb} x A new species ofloeroPsis "q. 83 etnrc.r.r.n'r-"vt-"XMXtkYNr'hSr'T.xNl:t '<.q an vq xN K AW"di"IL R '1"' :i ' r•:fi.- '.l -- !c',ll:,,1"tfi'S//'i•'1'//"s:-rrJz,/.i'i':.:t/•,",,,::, :i'/i'kr/1,1:i..,:iiL"ili./'1, 'g•,,,t.i'Jf`'J..'.,,l,;•/t•;t/l,{.///' i E B E e pt 6 r i,is#""1.•f 1";kv• .' sJ•,-f:.•/'[g-;,,1 r;'r•., ."' i-"'' Y"•;'i •• ;- '" E E m e - . .. e. t t:ii Ltt/t/t .ttt't' - E E /--x r 't t 't /i/tttt' tt tt' !;/'t ttttttl tt ,x r f 't. ' ..,,./ .t,:lt.t:t; . -:'J. X,x / . t-.t . : ... -, ./ ,. ../', ..- s . .' .". -,. L., ,; 1 'F•- ,,, ::rr;:•, t' .L'; ' ':,f•': 1 c 'h[. t:i/. ' ''''1: /' c." l''I'. dt'. ) { 1 / x l N$ "` .?,, .';+ ' :. ' - 1 ,,, " '/'' t" ' 'k, x 1,,. x v••I 1'••, ii.;.tt'Tl./ .. .. 'l:.t'.i/ ,1 : t,..1:II...'t g>•• .Tr-' tiLl ,-' L:,tL't-" :" t fitt ) L •/ r ' ""E'2:'.:""' •1''`' / ). i ':': ','1'. .''./,1'•"Ji" "' .,r'1"','J.;' ..' /tt[ rV," X-- '' "t -t ' /r '' . t,. .. ''"'t'.'t' tj'4' L f L 7 'if-) I D Sr t "'" la- ( 11} S..i x ttt. ttttt r .{.•:/,•,1. . ;,,it:L,..://;" -'f, i ..... '. , :tz ''' .t t. r ,,i• -L t. '" l•i L,, '' .< { XK h ,t,g:.: p.tt./t. t.:"u. t ttt .:. ;.,; /.... t,... ,, t•L: ,,i, 1 .. .,..,KX c };s,? .', . ... L' xx 1 , . t. )' .vtt ,;: .rt't LbleU trb . ,. '• .. 'L ;, ;N .; ,'J'//r•"'i.'i •-/• '/ij };/[iL iii )..li . ' [ .,' 1 'ii}'.J:hl'l':: "/L' :., ",,: x'' t, 1';11:-., t:t;t/t ;t/st s N ttt tt :,/r.t '.,,-. ttH tt-t,t. :. ' :fK ".`>g N, " "' ' 'ii' t '' -;.t'tttt:tj tt t',J•' •- l'-a L/s• 't'l,/.::' s-. tt -Ai 't'( N- Fig. 2. JoeroPsis karachiensis sp. nov. Adult male; T. L. = 3.0 mm. A, dorsal view; A', lateral margin of pleotelson with denticles; A", uropod; B, rostrum; C, right antenna 1; D, right antenna 2. Scale lineA = l mm. Scale line C-D = O.5 mm. Scale line B, A', A" = O.25 mm. /tt' /t t't:"itt.,t Quddusi B. Kazmi, Farzana Yousuf 84 A rp tu q II: E g s g• : B c e(e.-. r4 a Nss ttt ttt '"'/ tt / /ii'/ D s.-- x.IZ.. ,t fl .t. 1' c. iL L S-' Åéss a Vv { i F N ' ! l Q ,it o o 1 o E Fig. 3.loeroPsis fearachiensis sp. nov. Adult male; T. L = 3.0 mm. A, right mandible; B, lelt mandible; C, right maxilla I; D, right maxilla 2; E, right maxilliped; E maxillipedal palp. Scale line A, B, C, D, E = O.5 mm. Scale line F =: O.25 mm. f A new species ofloeroPsis 85 A Uh o.o. m< E E R 6 B E E 9 e ' l"""" D c ts Fig. 4. foeroPsis harachiensis sp. nov. Adult male; T. L. = A, right pereiopod1; B, dactylus of pereiopod I; C, dactylus of pereiopod; 7; E, right pleopod I. Scale line = A, C = O.5 mm. Scale Iine = B, D, E = O.25 mm. 3.0 mm. right pereiopod 7; D, 86 Quddusi B. Kazmi, Farzana Yousuf cephalon (excluding rostrum) 1.2 times wider than long, with pigmented dorso-lateral eyes. Rostrum (Fig. 2B) dome shaped, with transparent scales subapically and fringe of hair apically. Lateral margin of pereonites smooth, few setae in the submarginal area, lateral margin of pleotelson with 4-5 denticles (Fig. 2A') . Antenna 1 (Fig. 2C) of 2 peduncular and 4 flagellar segments, surface with few granules, basal peduncular segment the longest, its margins produced into transparent fringe of shallowly rounded teeth and few setae; this membrane extends to otherjoints; penultimate flagellarjoint with 2 strongly developed asthetascs, ultimate joint small, with 7 small and large setae. Antenna 2 (Fig. 2D) of 6 segments; basal segment the longest, almost all margins produced into transparent funges. Mandibles (Fig. 3A, B) asymmetrical. Right mandible with a palp of 3 anicles; spine row of 7 spines on left, 9 on right; molar slender, tapering. Maxilla 1 (Fig. 3C) inner ramus with 6 dista1 setae; outer ramus with 9 stout dentate spines. Maxilla 2 (Fig. 3D) inner ramus with 6 simple setae; outer lobes each bearing 4 setae. Maxilliped (Fig. 3E) endite broad, bearing four coupling hooks, medio-distally emarginate, armed with 5 stout, flattened spines; palp (Fig. 3F) of 5 articles, penultimate article the longest. Pereiopods similar (Fig. 4A, B) without any armature except for few setae on all the segments, the dactylus with three terminal ungui (Fig. 4B, D) . PIeopod 1 (Fig. 4E) laterodistal lobes triangular, blunt; mesiodistal lobes triangular, with 12- 13 marginal setae. Uropod (Fig. 2A") with mediodistal angle not hook like but acute, inner ramus bearing 6 setae, outer ramus shorter with 9 long and short setae. Female: Unknown. Remarks: The genusJoeroPsis Koehler, 1885 was the only one genus in the family Joeropsidae until Just (2001) described two new genera Rugo7'oeroPsis and ScaPhoioeroPsis from the lower shelf and upper bathyal of southeastern Australia. The genusloeroPsis contains 54 widespread species in the tropical and temperate waters Uust, 2001) .JoeroPsis rathbzanae is probably pantropical cosmopolite (Menzies and Glynn, 1968). From the Indian Ocean, 23 species have been summarized by Kensley (2001), and 7 species were described as new by Kensley and Schotte (2002), but no species were collected for the northern Arabian Sea. Kensley and Schotte (2002) gave five characters for discriminating Joeropsis species: "degree of setation of the body; serration of the lateral margins of the cephalon; shape of the rostrum; presence and absence ofa strong mediodista1 tooth on the uropodal protopods; serration of the lateral margins of the pleon", and colour pattern of live or freshly dead specimens. Using Kensley and Schotte's (2002) keyJ karachiensis can be included within the species group having pleotelson margin fewer than 7 teeth. However the teeth in our specimen are visible only under high magnification, also the pleotelson is distinct from other species having a submarginal row of setae on the ridge which perhaps separates1. harachiensis from known congeners (Schotte, pers: comm. Q. B. K). Two other species,1. waltervadi Kensley, 1975 andf. bicarinata Just, 2001, differ from other species offoeroPsis in having such longitudinal ridges running along the dorsum, which is confined to the pereon inl. waltervadi while sharp keel extends to the pleotelson in J. bicarinata. In J. karachiensis the pattern of longitudinal ridges is different from the above given patterns in the two species, here being confined only to the pleotelson. Other characters in whichJ. karachiensis differs from allJoeroPsis species, is the maxilliped A new species ofloeroPsis basis which reaches to middle ofpalp article 2 resembling to that of ScaPho7'oeroPsis Just (2001). Etymology: 'Ihe specific epithet, learachiensis refers Karachi, where the first specimen of the suborder was recorded. Acknowledgments Senior author wishes to acknowledge Marilyn Schotte, Srnithsonian Institution, Washington, for being helpfu1. The polychaete colony and holotype was collected and photographed by Dr. F. A. Mangi ofMarine Reference Collection & Resource Centre, University of Karachi and identified by Prof. Dr. Javed Mustaquim of Centre of Excellence in Marine Biology, University of Karachi. References Just, J., 2001, Bathyal Joeropsididae (Isopoda: Asellota) from south-eastern Australia, with description of two new genera. Mem, Mus. Vic4 58 (2) : 297-331. Kensley, B. and M. Schotte, 2002. New species and records of Asellota from the Indian Ocean (Crvstacea: Peracaridea: Isopoda) . fournat ofNatural History 36: 1421-1461. Kensley, B., 1975, Five species offoeroPsis from the southern Indian Ocean (Crustacea, Isopoda, Asellota) . Ann. Afr. Mers., 69, 367-380. Kensley, B,, 2001. Biogeography of the marine Isopoda of the Indian Ocean, with a checklist of species and recorcl. PP. 205-264 In: B. Kensley and R. C. Brusca (ecls.), JsoPod Systematics and Evolution. Crustacean Issues. I 3 Rotterdarn/Brookfield : A. A. Balkema. 357 pages. Koehler, R., 1885, Description d'un Isopode nouveau, le foeroPsis brevieornis. Annales des Sciences Natureltes, (Zoologie?,Paris, 19 (6):1-7, Menzies, R. J., and S. GIynn, A 1968. The Common Marine Isopod Crvstacea ofPuerto Mco onthe Fauna of Curacao and other Caribbean Islands., XXVII: 1-133. View publication stats 87