PEREZ FARFANTE: REVISION OF PENAEID SHRIMP GENUS PEN AEOPSIS 



plus epigastric teeth 8-15, basal rostral teeth 

 close together, ultimate 3 or 4 usually relatively 

 widely spaced; first rostral tooth situated in line 

 with orbital margin. Postrostral carina low, al- 

 though well defined, behind epigastric tooth, end- 

 ing at about posterior 0.4 length of carapace, 

 beyond level of dorsal extremity of cervical sul- 

 cus; small dorsal tubercle located near posterior 

 margin of carapace. Antennal and hepatic spines 

 subequal in size, latter situated distinctly ventral 

 to antennal spine. Anteroventral angle of 

 carapace broadly obtuse (Figure 12A). Antennal 

 carina short; cervical carina sharp, accompany- 

 ing sulcus well marked; hepatic carina sigmoid 

 anteriorly (from below hepatic spine to apex of 

 ptergostomian spine), hepatic sulcus well marked 

 along carina, very shallow posteriorly. Bran- 

 chiocardiac carina, extending well behind hepatic 

 sulcus posterodorsally to near margin of 

 carapace, indistinct in many large individuals. 



Antennular peduncle with length equivalent to 

 about 0.65 that of carapace, third article stouter 

 and longer in male than in female, about 1.50 as 

 long as second in former and 1.25 in latter; pro- 

 sartema not quite reaching distal margin of first 

 article; distolateral spine long, slender, and 

 sharp, reaching between basal 0.65 and distal 

 margin of second article; stylocerite ending in 

 small spine, length about 0.4 that of first article. 

 Flagella similar to those of P. rectacuta, but ven- 

 tral flagellum in male with less conspicuous knob 

 at junction between semicircular proximal part 

 and straight distal part. 



Scaphocerite extending to, or barely surpass- 

 ing, antennular peduncle; lateral rib ending in 

 sharp spine ending slightly short of distal margin 

 of lamella. Antennal flagellum broken in speci- 

 mens examined, but not <2.5 as long as body. 



Third maxilliped of male extending as far as 

 distal 0.35 of third antennular article, that of 

 female to distal margin; ratio of dactyl/propodus 

 about 0.70 in male and 0.75 in female. 



First pereopod extending to about distal end of 

 carpocerite. Second pereopod overreaching car- 

 pocerite by length of dactyl or by almost entire 

 propodus (i.e., reaching at least distal 0.4, at most 

 0.1, of first antennular article). Third pereopod of 

 male reaching between proximal 0.35 and distal 

 end of second article, that of female, between mid- 

 length and distal end of third article. Fourth 

 pereopod extending to distal end of carpocerite or 

 surpassing it by length of dactyl. Fifth pereopod 

 reaching at least midlength of second article or 



B 



FIGURE 12— Penaeopsis eduardoi. holotype. A, Anteroventral 

 part of carapace. B, Telson and right uropod, dorsal view. Scales 

 = 5 mm. 



slightly overreaching third. Order of pereopods in 

 terms of their maximum anterior extensions: 

 first, fourth, second, third, and fifth (or fifth, and 

 third). Third maxilliped reaching about as far as 

 fifth pereopod. 



Abdomen with sixth somite elongate, about 1.7 

 times maximum height, bearing rather strong, 

 usually interrupted cicatrix on lateral surface. 

 Telson (Figure 12B) with lateral margins armed 

 with two pairs of small, movable spines; pair of 

 fixed spines very long, in young reaching level of 

 apex of telson; terminal portion hastate, its 

 length 6-7 times basal width. Mesial ramus of 

 uropod reaching, or slightly overreaching, apex of 

 telson; lateral ramus surpassing mesial one by 

 almost 0.2 of its own length. 



Petasma (Figure 13A,Bl with distomedian pro- 

 jection virtually obsolete, distal plate relatively 

 broad, and proximal plate flush with surrounding 

 membranous portion, lacking mesial crest. Rib of 

 dorsolateral lobule terminating proximally in 

 subcircular process. Ventral costa with distolat- 

 eral portion situated marginally (where bent in- 

 ward), curving rather gently at about 120° and 

 continuing in long spine distodorsally beyond row 

 of cincinnuli. 



Appendix masculina (Figure 13C) transversely 

 oval, broader than long, width 1.35-1.60 length, 

 strongly convex dorsally, and bearing short setae 

 around entire margin. 



Thelycum (Figure 14) with anterior border of 



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