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Crustacea: Caridea: Pasiphaeidae) from North-Western Australian Waters

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Crustacea: Caridea: Pasiphaeidae) from North-Western Australian Waters The Beagle, Records of the Museums and Art Galleries of the Northern Territory, 1994 11:167-173 A NEW SPECIES OF PASIPHAEA SAVIGNY (CRUSTACEA: CARIDEA: PASIPHAEIDAE) FROM NORTH-WESTERN AUSTRALIAN WATERS. YUKIO HANAMUR A Nansei National Fisheries Research Institute, CRUSTACEA I IPDADW uir^vinr. 7iQ-nA LiDnMnY Ohno-cho, Hirosima 739-04, Japan. SMITHSONIAN INSTITUTION RETURN TO W-119 ABSTRACT A new species of Pasiphaea Savigny is described, based on material collected from north-western Australian waters. This species is characterized by having the dorsal margin of the carapace bluntly carinate, the abdomen carinate dorsally at least on the second to sixth somites and the telson tip weakly emarginate distally. These features are associated with a consistently larger number of meral spines on the first and second pereopods when compared with related species. KEYWORDS: Crustacea, Caridea, Pasiphaeidae, Pasiphaea levicarinata n. sp., north- west Australia. INTRODUCTION SYSTEMATICS Shrimps of the genus Pasiphaea Savigny, 1816, in Australian waters have been studied by Family Pasiphaeidae Hanamura (1987; 1989) and Kensley et al. Genus Pasiphaea Savigny (1987), resulting in the recognition of six spe- Pasiphaea levicarinata n. sp. cies in the Australian Pasiphaea fauna. (Figs 1-2) Dr A.J. Bruce and several members of the CSIRO Fisheries Division have continued to Pasiphaea sinensis'. Hanamura, 1987:15, fig. make available samples of shrimps obtained 2 (not Hayashi and Miyake, 1971). during surveys of the Australian deep water Pasiphaeaspecies 1 Wadley and Evans, 1991: fauna. In recent collections of deep-sea shrimps 14, 2 figs on p. 14. examined were more than 30 specimens belong- Type material. HOLOTYPE - Ovig. female, ing to Pasiphaea. Those from north-western cl 32.0 mm, 4 December 1991, 18° 30'S 117° Australian proved to belong to an undescribed 23'E, 0135-0615 hrs, demersal trawl, depth 530 species. This new species is characterized by m, FY Striker, coll. R. Jackson (NTM Cr010906). having a blunt carina on the dorsal margin of the PARATYPES - 6 ovig. females, cl 27.5-32.6 carapace, a distinct dorsal carina on the second mm, same data as holotype (NTM Cr 010907); to fifth abdominal somites as well as a blunt 3 males, cl 33.5-38.8 mm, 25 January 1988, Sta. carina on the anterior portion of the sixth somite, S9, 13° 06'S 122° 181}, trawl, depth 900-1000 the telson very weakly emarginate at the poste- m, FV Territory Pearl, coll. B. Wallner (NTM rior end, and the meri of the first and second Cr 007210); 1 male, cl 36.0 mm, data same as pereopods armed with a comparatively larger preceding (NTM Cr 007211); 1 male, cl 32.1 number of spines than in related species. mm, 3 ovig. females, cl 31.3-32.2 mm, data The type specimens, including the holotype, same as holotype (NSMT-Cr 11336). are housed in the Northern Territory Museum of Additional material. 1 female, cl 31.9 mm, Arts and Sciences (NTM) except for some 8° 38'S 132° 00'E, depth 525-540 m, FV Ocean paratypes that are deposited in the National Pearl, coll. M. Sachse (NTM Cr 006844); 2 Science Museum, Tokyo (NSMT). males, cl 36.0 and 38.1 mm, 25 January 1988, 167 Y. Hanamura Sta. S8, 13° 17'S 122° 21'E, trawl, depth 600- 1.65-1.76 (average 1.70) times as long as penul- 740 m, FV Territory Pearl, coll. B. Wallner timate segment. (NTM Cr 007212); 1 male, cl 28.8 mm, 5 First pereopod (Fig. 2g,h) extending beyond females, cl 26.0-34.0 mm, 7 ovig. females, cl antennal scale by length of whole to three- 26.3-36.2 mm, data same as for holotype. fourths of finger length, fingers 0.70-0.89 (aver- age 0.82) times as long as palmar length, Description. Rostrum (Fig. la) rather stout, ventromesial margin of palm with four to six semi-triangular, extending obliquely upward, minute spines, basis unarmed on ventral margin with sharp terminal spine reaching fully or just except for terminal tooth, ischium unarmed, falling short of anterodorsal end of carapace, merus armed ventrally with 5-15 (commonly 8- anterior margin slightly convex. 12 in greater than 80% of specimens) spines, Carapace (Fig. lb) remarkably compressed and dorsal portion slightly expanded distally, laterally along anterior five-sevenths of dorsal bearing 9-12 small spines. Second pereopod margin, forming blunt or very weak carina on (Fig. 2i, j) extending beyond antennal scale by that portion, while distinctly rounded posteriorly; two-thirds to four-fifths of finger length, fingers anterior half of dorsal margin noticeably con- 1.03-1.33 (average 1.22) times as long as palmar cave in lateral aspect. Suprabranchial ridge rather length, ventromesial margin of palm with three marked. Branchiostegal spine marginal, extend- to seven minute spines, basis unarmed ventrally ing anteriorly beyond anterolateral margin of except for terminal tooth, ischium unarmed, carapace. Branchiostegal sinus rather deep, and merus armed ventrally with 19-30 (commonly nearly right-angled. 24-28 in greater than 70%) spines and 3-10 Abdomen (Fig. lc) with first somite very small spines on dorsal margin, especially on weakly carinate dorsally or rounded, second to distal third. Third pereopod (Fig. 2k) slender, fifth somites sharply carinate, sixth somite cari- reaching proximal end of propodus of second nate on anterior two-thirds, while posterior por- pereopod, carpus about one-tenth as long as tion is flattened dorsally. Sixth somite 1.29-1.44 distal two segments combined. Fourth pereopod (average 1.37) times as long as fifth. No postero- (Fig. 21) distinctly shorter than fifth pereopod, median spine on any somite. Telson (Fig. lg,h) reaching to or slightly exceeding end of ischium 0.92-1.08 (average 0.96) times as long as sixth of second pereopod. Fifth pereopod (Fig. 2m) somite, weakly sulcate dorsally, although this extending slightly beyond mid-length of merus groove is obscure at distal third; posterior end of second pereopod. very shallowly emarginate, and armed with about Exopod of third pleopod 0.32-0.36 (average 11-13 terminal spines, largest of which is lateral 0.33) times as long as carapace. pair (distalmost spines of telson more or less Appendix masculina (Fig. 2n) about two- damaged). thirds as long as appendix interna. Eye (Fig. Id) with cornea well pigmented, Branchial formula same as known for the wider than eyestalk. genus. First antenna (Fig. le) with third segment of Size. Smallest ovigerous female is cl 26.3 peduncle bearing sharp spine at distal end of mm, and largest specimen is cl 38.8 mm (male). ventrolateral margin, second segment shortest, Egg size. Non-eyed eggs 1.60-1.80 x 1.30- nearly half as long as first segment. Stylocerite 1.35 mm. twisted, ending in sharp spine, and barely reach- Colour. Body is basically white (probably ing or falling just short of distolateral end of first semi-transparent), and reddish spots are scat- segment. tered over nearly the whole of the body, concen- Second antenna (Fig. If) with antennal scale, trated especially along the ventrolateral margin 0.45-0.52 (average 0.49) times as long as cara- of the body and dorsal margin from the second pace, and 3.40-3.85 (average 3.57) times as long abdominal somite to end of the telson, while the as wide, outer margin convex, distolateral spine lateral portion of the abdomen is less pigmented rather long, reaching well beyond distal end of due to sparse distribution of red patches. The lamella. Basicerite with sharp spine at appendages are also well pigmented (see Wadley distoventral end. and Evans 1991). Mouthparts as figured (Figs 2a-f). Third Distribution. Only known from north-west- maxilliped barely reaching or extending slightly ern Australian waters, and with a vertical range beyond end of antennal scale, distal segment of 500 to 1000 m. 168 New Pasiphaeafrom NW Australia Fig. 1. Pasiphaea levicarinata sp. nov. a-c, holotype, ovig. female cl 32.0 mm and d-h, paratype, ovig. female, cl 31.8 mm. a, anterior part of body;b, carapace; c, abdomen; dv eye;e, 1st antenna; f, 2nd antenna; g, telson; h, same, distal end enlarged. 169 Y. Hanamura i, 2nd pereopod; j, same, di stal portion; k, 3rd pereopod;l, 4th pereopod;m, 5th pereopod;n, appendix masculina and appendix interna. 170 Table 1. Diagnostic characters and differentiation of seven related species ofPasiphaea Species Carapace Abdomen lstpereopod 2ndpereopod literature P. affinis dorsal margin nearly straight in lateral aspect, 2nd to 5 th somites bluntly carinate <5(3) meral spines 6-10 (6) meral spines Rathbun 1902,1904; notsinuous onanteriorportion; rostrum triangular- dorsally; telson distinctly grooved [number of spines of holotype Burukovsky & Romen- shaped, directed obliquely upward, tip not directed distally, 2/5 times as deep as distal female in parentheses] sky 1987; forward, distal extremity barely reaching end of wide, bearing about 20 spines distally Chace, pers. comm. carapace P. magna dorsal margin descending on anterior 2/3; rostrum 2nd to 6th somites carinate dorsally; 4 or 5 meral spines 12 or 13 meral spines Faxon 1893,1895; directed forward well beyond distal end of carapace, telson very weakly sinuous distally, Mendezl981 fully reaching cornea of eye bearing 12 spines P. nishiei dorsal margin weakly sinuous on anteriorhalf in 2nd to 4th somites carinate dorsally; unarmed on merus 1 meral spine Iwasaki 1990 lateral aspect; rostrumnearly triangular-shaped, telson truncated distally, bearing 8 directed obliquely upward, tip slightly turned spines anteriorly, distal extremity reaching anterior end ofcarapace P. princeps dorsal margin descending on anterior 2/5; rostrum 2nd to 6th somites carinate dorsally; unarmed on merus 5 meral spines Smith 1884; directedforward or slightly upturned distally, telson deeply grooved distally, about Iwasaki 1990 distal extremity extending beyond end of carapace, as deep as distal width, bearing about but not reaching to cornea of eye 20 spines P.
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