Cryptopenaeus Crosnieri, a New Species of Shrimp, and a New Record of C. Sinensis (penaeoidea: Solenoceridae) from Australian Waters

Cryptopenaeus crosnieri, a new species of solenocerid shrimp, is described from four specimens collected in Australian waters. It differs from C. catherinae in exhibiting neither a notch nor a depression on the postrostral carina, in having a longer scaphocerite, and in lacking an ischial spine on the third pereopod. Also, the thelycum exhibits a pair of small, flat to weakly convex plates, instead of strong bosses, on the anterior part of sternite XIII. Cryptopenaeus crosnieri differs from C. sinensis (originally described as the type and only species of the new genus Crassipenaeus), in lacking the three rounded thelyca1 prominences on sternite XIV typical of the latter, and in the presence of a meral spine on the third pereopod. The solenocerid genus Cryptopenaeus was proposed by De Freitas (1979) for C. catherinae, a new shrimp taken off southern Mozambique at depths between 310 and 500 m. Recently, three additional members of the genus have been discovered, one of them, C. sinensis (Liu and Zhenru, 1983) from the South China Sea, another from the waters ofIndonesia, which is being described by A. Crosnier, and the third, described herein, from a locality off eastern Australia. Four specimens of the latter species were collected off the northeast coast of New South Wales by the RlV Kapala of the New South Wales Fisheries. The new record of C. sinensis is based on a male obtained off the northwest coast of Australia, southwest of Cape Leveque, by the U.S.S.R. RlV Lira. This latter species is the type-species of a new genus, Crassipenaeus Liu and Zhenru, 1983, which we consider to be a synonym of the earlier Cryptopenaeus De Freitas, 1979. The terminology used in the descriptions has been discussed and illustrated by Perez Farfante (1969, 1977). Cryptopenaeus crosnieri, new species Figs. 1,2 Material.-Holotype, 'i?, Australian Museum, AM-P32481, carapace length 29.5 mm, rostral length 8.5 mm, total length about 102 mm. Type-locality: NE of North Solitary Island, New South Wales, Australia, 29°47-49'S, 153°41'E, 234 m, RlV Kapala sta 78-05-07, shrimp trawl.-Paratypes, 1 'i?, Australian Museum, 2 'i?, National Museum of Natural History, Smithsonian Institution, Washington, D.C., USNM 189097, collected with holotype. Description.-Body relatively robust (Fig. 1); carapace microscopically setosepunctate, abdomen glabrous. Rostrum horizontal, with dorsal margin straight and ventral margin convex, short, its length 0.30 to 0.18 that of carapace, decreasing Fig.!. Cryptopenaeus crosnieri, holotype g 29.5 mm carapace length, NE of North Solitary Island, New South Wales, Australia. Lateral view. Scale = 10 mm. proportionally with increasing size, and in adults reaching between distalmost part of first antennular article and midlength of second. Rostral plus epigastric teeth 7-9, fifth tooth situated at level of orbital margin, last tooth distinctly posterior to apex. Adrostral carina strong, separated from teeth by conspicuous groove, dorsal border of groove covered with narrow band of densely set short setae. Postrostral carina well marked, long, almost reaching posterior margin of carapace and lacking notch or depression. Orbital spine absent; postorbital spine slender, sharp, and long; antenna 1 spine minute; pterygostomian spine strong, with broad base; hepatic spine slender, sharp, and as long as postorbital. Branchiostegal and suprahepatic spines lacking. Gastro-orbital sulcus lacking; cervical sulcus, accompanied by raised, sharp carina, gently sinuous, its dorsal extremity ending distinctly ventral to postrostral carina at about midlength of carapace; hepatic sulcus rather deep, subhorizontal posteriorly, anterior part of sulcus accompanied by sharp carina; branchiocardiac carina almost indistinguishable; submarginal carina well defined. Antennular peduncle about 0.5 as long as carapace. Prosartema narrow, acute, long, attaining proximal 0.4 length of second antennular article, and bearing long, densely set marginal setae. Stylocerite ending in sharp spine and extending 0.60.7 distance between its proximal extremity and mesial base of distolateral spine; latter spine sharp, long, reaching as far as proximal 0.3 of second article. Antennular flagella subequal in length, long, 2.2 times carapace length in shrimp 29.5 mm cl and 1.4 in shrimp 50 mm cl; mesial flagellum slender and subcylindrical throughout its length, lateral flagellum moderately depressed in proximal half where about twice as broad as mesial, then becoming filiform. Scaphocerite exceeding antennular peduncle by as much as 0.25 of its own length; lateral rib Fig. 2. Cryplopenaeus crosnieri. holotype: A, Telson and right uropod, dorsal view; B, Thelycum.