PEREZ FARFANTE: REVISION OF GENUS PSEUDARISTEUS 



Pseudaristeus gracilis (Bate 1 888) 



Figures 4fi, 9, 15-17 



Hemipenaeus gracilis Bate 1888:302, pi. 44, fig. 2 

 [syntypes 3 0-3 9, BMNH; type-locality: off Tablas 

 I, Philippines; 12°21'N, 122°15'E; 1,240 m; blue 

 mud; 16 January 1975; Challenger stn 207]. De 

 Man 1911:26. Estampador 1937:493. Anderson 

 and Lindner 1945:301. Burukovsky 1974:48. 



Hemipeneus gracilis. Faxon 1895:198. 



Pseudaristeus gracilis. Crosnier 1978:76, fig. 27 

 bis. 30e. 



Material. 



Philippines— 8 9, USNM, Iligan Bay, northern 

 Mindanao; 8°15'20"N, 123°57'E; 750 m; gray mud, 

 sand; 7 August 1909; Albatross stn 5511. 1 9, 

 USNM, Iligan Bay, northern Mindanao; 8°34'48"N, 

 124°01'24"E; about 1,280 m; 8 August 1909; Alba- 

 tross stn 5515. 1 o", USNM, Macajalar Bay, north- 

 ern Mindanao; 8°41'30"N, 124°35'40"E; 1,013 m; 

 green mud, fine sand; 4 August 1909; Albatross stn 

 5499. 1 o- 2 9, USNM, eastern Mindanao Sea; 

 9°06'30"N, 125°00'20"E; 1,785 m; gray mud; 2 

 August 1909; Albatross stn 5495. 1 9, USNM, N 

 of Siquijor I; 9°12'45"N, 123°45'30"E; 1,472 m; 

 green mud, globigerina; 11 August 1909; Albatross 

 stn 5526. 19, USNM, eastern Mindanao Sea; 

 9°12'45"N, 125°20'E; 1,344 m; gray mud; 1 August 

 1909; Albatross stn 5492. 1 9, USNM, between 

 Bohol and Siquijor Is; 9°22'30"N, 123°42'40"E; 719 

 m; globigerina ooze; 11 August 1909; Albatross stn 

 5527. 2 0-19, USNM, eastern Mindanao Sea; 

 9°24'N, 125°12'E; 1,346 m; green mud, coral; 1 

 August 1909; Albatross stn 5491. 19, USNM, off 

 Panaon Is, S of Leyte; 9°58'00"N, 125°07'40"E; 

 1,417 m; green mud; 10 April 1908; Albatross stn 

 5203. 2 9, USNM, Sogod Bay, southern Leyte; 

 10°N, 125°06'45"E; 1,412 m; green mud; 31 July 

 1909; Albatross stn 5488. 1 c, USNM, Sogod Bay, 

 southern Leyte; 10°02'45"N, 125°05'33"E; 1,339 m; 

 green mud; 31 July 1909; Albatross stn 5487. 1 o- 

 1 9, ZSI, Sogod Bay, southern Leyte; 10°10'00"N, 

 125°04'15"E; 1,013 m; gray sand, mud; 10 April 

 1908; Albatross stn 5201. 2 9, MP, SW of Tablas 

 I; 12°09'N, 122°14'E; 1,404 m; 6 June 1985; 

 MUSORSTOM III, stn CP 136. 3 o- 3 9 syntypes. 1 

 9, MP, SE of Bondoc Point, Luzon; 13°02'08"N, 

 122°37.1'E; 1,030-1,190 m; 25 November 1980; 

 MUSORSTOM II stn 39. 3 o- 3 9, MP, NE of Bon- 

 doc Point, Luzon; 13°23.2'N, 122°20.7'E; 820-760 

 m; 26 November 1980; MUSORSTOM II stn 44. 



Diagnosis.— Optic calathus relatively short, mesial 

 margin 1.0-1.3 times distal width. Anterolateral 

 carina lacking. Ventral extremity of cervical carina 

 forming sharp-edged arc. Posterior extremity of 

 hepatic sulcus turned ventrally. Third article of 

 antennular peduncle not expanded laterally; males 

 with ventral antennular flagellum sinuous and ulti- 

 mate article of third maxilliped straight and slight- 

 ly broadening proximomesially before tapering to 

 apex. Pereopods not covered with minute setae. 

 Petasma with distalmost part of dorsolateral lobule 

 narrowing to subangular apex, and ventral surface 

 studded with minute setae; ventral costa slightly in- 

 clined distomesially and contracted just proximal to 

 spatulate or paddlelike terminal process. Thelycum 

 with plate of sternite XIV short and produced in 

 moderately long anterolateral hoods; median plate 

 of sternite XIII relatively short (not nearly reach- 

 ing spine on sternite XII), broad (maximum width 

 0.80-0.93 length), thickened and expanded postero- 

 laterally in conspicuous prominences. 



Description.— Body slender, densely studded with 

 minute setae. Rostrum in males short, its length 

 0.25-0.30 CL and tapering gradually to sharp apex; 

 in females long, 0.90-1.50 CL, relatively deep and 

 convex basally, styliform and slightly upturned ante- 

 riorly. Rostral plus epigastric teeth 3; rostral teeth 

 situated variably in males, basally in females. Adros- 

 tral carina strong, in males almost reaching apex 

 of rostrum, in females extending just anterior to 

 second tooth. Antennal spine sharp; branchiostegal 

 spine longer than antennal, acutely pointed. Cervical 

 sulcus crossing postrostral carina (rarely only reach- 

 ing it) at about 0.45 CL from orbital margin, ven- 

 tral part turning anteriorly; accompanying carina 

 blunt, except for sharp, strongly arched ventral ex- 

 tremity; postcervical sulcus reaching, but not cross- 

 ing, postrostral carina at about 0.7 CL from orbital 

 margin. Postrostral carina, extending to 0.8-0.9 CL 

 from orbital margin, well marked and sharp to cer- 

 vical sulcus, low and blunt posteriorly, and followed 

 by small tubercle situated near posterior margin of 

 carapace. Anterolateral carina lacking; gastro- 

 orbital carina strong; antennal carina relatively 

 short; branchiostegal-hepatic carina long, raised and 

 sharp. Orbito-antennal sulcus shallow; deep hepatic 

 sulcus fusing with branchiocardiac sulcus before 

 turning obliquely almost ventrad forming small 

 branch nearly reaching margin of branchiostegite; 

 branchiocardiac sulcus, accompanied by carina, deep 

 and long, extending posteriorly to near margin of 

 carapace; blunt arched ridge, disposed dorsal to 

 posterior part of hepatic sulcus and anterior part 



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