PEREZ FARFANTE: REVISION OF PENAEID SHRIMP GENUS PENAEOPSIS 



River, Kipini, staff Institute of Oceanographic 

 Sciences. 3 9 , BMNH, off Formosa Bay, 290 m, 

 15 February 1975, staff Institute of Oceano- 

 graphic Sciences. Id 1 J, USNM,off Ras Ngo- 

 meni, 300-310 m, 12 December 1975, Professor 

 Mesyatsev. 4 V , BMNH, off Kenya, 15 February 

 1975, staff Institute of Oceanographic Sciences. 



TANZANIA— 3 5, BMNH, Pemba Channel, 

 329 m [in Sewell 1935], 14 January 1934, John 

 Murray Expedition stn 110. 1 ? , BMNH, Pemba 

 Channel, 439 m, 12 January 1934, John Murray 

 Expedition stn 107. lid 17 9, BMNH NW of 

 Zanzibar I, 280 m, 11 January 1934, John Murray 

 Expedition stn 105A, 2d 29, RMNH, off Kundu- 

 chi, 20 km N of Dar es Salaam, 370-400 m, July 



1974, C. Sankarankutty. 

 MOZAMBIQUE— 4 9 , USNM, Monte Belo, 270 



m, 28 October 1975, E. Sorensen. 



SOUTH AFRICA-^d, USNM, 19, ORI, off 

 Zululand, Natal, 280 m, A. J. de Freitas. 3d 

 119, SAM-USNM, off Natal, 454-280 m, 25 May 



1975, Meiring Naude stn SM15. 



Diagnosis. — Rostrum arched (usually strongly so) 

 and short, reaching at most midlength of second 

 antennular article. Anteroventral angle of 

 carapace obtuse. Telson with two pairs of mova- 

 ble spines. Petasma with proximal plate of dor- 

 somedian lobule bearing strong mesial crest; 

 proximal process of rib of dorsolateral lobule sub- 

 oval and directed mesially; ventral costa ending 

 distally in roughly semicircular process. Thelycal 

 plate of sternite XIV with anterior border usually 

 concave on each side of posteromedian projection 

 of sternite XIII and distinctly slanting postero- 

 laterally; medism ridge broadest and highest pos- 

 teriorly, usually gently tapering anteriorly (some- 

 times reduced to posterior protuberance), and 

 flanked by deep, broad depressions; median plate 

 of sternite XIII subtriangular to orbicular. 



Description. — Rostrum (Figure 1) usually mark- 

 edly arcuate (always strongly so in young), deep 

 basally, and short, in adult reaching at most mid- 

 length of second antennular article, its length 

 ranging from about 0.35 to 0.45 that of carapace. 

 Rostral plus epigastric teeth 9-13; rostral teeth 

 evenly spaced and close together along entire 

 margin, second rostral tooth, occasionally third, 

 located in line with orbital margin. Postrostral 

 carina extending posteriorly for short distance 

 beyond epigastric tooth, ending at level of dorsal 

 extremity of cervical sulcus; small dorsal tubercle 

 (occasionally indistinct) located near posterior 

 margin of carapace. Antennal spine slender, 

 sharp, and followed by short but well-defined 

 carina; hepatic spine about as long as, and 

 positioned ventral to but close to level of, anten- 

 nal spine. Anteroventral angle of carapace (ven- 

 tral membrane excluded) moderately to broadly 

 obtuse (Figure 2A). Cervical carina sharp, ac- 

 companying sulcus well marked; hepatic carina 

 descending obliquely in eu-c anteroventrally from 

 below hepatic spine, then continuing in almost 

 straight line to apex of pterygostomian spine; 

 hepatic sulcus barely distinct posteriorly; bran- 

 chiocardiac carina strong to almost indistinct, ex- 

 tending posterodorsally in arc, occasionally in 

 sigmoidal curve, from behind hepatic sulcus to 

 rather near posterior margin of carapace. 



Mandible, first maxilla, and first maxilliped as 

 illustrated (Figure 3 A-C). 



Antennular peduncle with length equivalent to 

 about 0.75 that of carapace, third jtfticle slightly 

 stouter and longer in male than in female, about 

 1.65 as long as second in former and 1.45 in lat- 

 ter; prosartema falling conspicuously short of dis- 

 tal margin of eye, but its long setae reaching that 

 far; stylocerite ending in small spine, length 

 about 0.4 that of first article; distolateral spine 

 long, slender, and sharp, reaching base of distal 



Figure l. — Penaeopsis balssi, S 21.5 mm cl, Formosa Bay, Kenya. Cephalothorax, lateral view. Scale = 5 mm. 



725 



