PEREZ FARFANTE: AMERICAN SOLENOCERID SHRIMPS 



Hymenopenaeus nereus (Faxon 1893) 

 Figures 9, 18B, 20-23 



Haliporus nereus Faxon 1893:213 [syntypes: 1 9, 

 MCZ 4645, S of Cabo Blanco, Costa Rica, 5°30'N, 

 86°45'W, 1,067 fm (1,952 m), 27 February 1891, 

 Albatross stn 3366. 1 9 , USNM 21177, S of Mor- 

 ro de Puercos, Panama, 7°06'15"N, 80°34'00"W, 

 695 fm (1,271 m), 23 February 1891, Albatross 

 stn 3353. 2 9, USNM 21178, off Pen de Azuero, 

 Panama, 6°21'N, 80°41'W, 1,793 fm (3,279 m), 

 7 March 1891, Albatross stn 3382. 1 6 2 9, 

 USNM 21180, NW of Is Galapagos, Ecuador, 

 2°34'N, 92°06'W, 1,360 fm (2,487 m), 5 April 

 1891, Albatross stn 3413. 2 9, MCZ 4646, NW 

 of Punta Galera, Ecuador, 1°07'N, 80°21'W, 

 1,573 fm (2,877 m), 23 March 1891, Albatross 

 stn 3398. 1 6, MCZ 4647, NW of Punta Galera, 

 Ecuador, 1°07'N, 81°04'W, 1,740 fm (3,182 m), 

 24 March 1891, Albatross stn 3399. 2 9 , USNM 

 21179, E of Is Galapagos, Ecuador, 00°36'S, 

 86°46'W, 1,322 fm (2,418 m), 27 March 1891, 

 Albatross stn 3400. 1 9 , Is Galapagos, Ecuador, 

 00°04'00"S, 90°24'30"W, 885 fm (1,619 m), 

 3 April 1891, Albatross stn 3407]. Faxon 1895: 

 189, pi. 48, fig. 1-ld. Bouvier 1906b:3; 1908:80. 

 de Man 1911:7. 



Hymenopenaeus nereus. Burkenroad 1936:104; 

 1938:60. Ramadan 1938:60. Crosnier and For- 

 est 1973:256, fig. 83c. 



Materm/.-Syntypes, which are the only material 

 ever recorded; 1 9 collected at Albatross stn 3407 

 has not been located. 



Description -Rostrum (Figure 21) relatively short, 

 its length about 0.3 that of carapace, reaching 

 about midlength of second antennular article, 



horizontal or slightly upturned, tapering to sharp 

 tip, and with dorsal and ventral margins straight. 

 Rostral plus epigastric teeth 8; epigastric tooth 

 situated at about 0.4 cl from orbital margin, first 

 rostral (largest of all) at approximately 0.3, and 

 base of third opposite to orbital margin. Adrostral 

 carina low, sharp, extending from orbital margin 

 almost to apex of rostrum; orbital margin project- 

 ing anteroventrally in narrow shelf. Postrostral 

 carina strong to near posterior margin of cara- 

 pace, followed by small tubercle. Pterygostomian 

 spine slender and sharp, like other lateral spines 

 on carapace; postorbital (located directly posterior 

 to antennal), pterygostomian, and branchiostegal 

 continuous with sharp basal carina, that continu- 

 ous with branchiostegal merging with sharp 

 hepatic carina. Cervical carina strong; sulcus 

 extending to, but not crossing, postrostral carina, 

 its dorsal extremity located immediately posterior 

 to midlength of carapace; hepatic carina sharp, 

 its accompanying sulcus deep; additional short 

 carina lying dorsal and parallel to hepatic sulcus; 

 posthepatic carina long, running almost to pos- 

 terior margin of carapace; branchiocardiac carina 

 also long, extending nearly to posterior margin of 

 carapace; short sulcus extending posterodorsally 

 from near posterior end of branchiocardiac; sub- 

 marginal carina well defined, running along 

 entire length of branchiostegite. 



Eye as illustrated (Figure 18B). 



Antennular peduncle length equivalent to 

 about 0.4 that of carapace; prosartema broad, 

 reaching distal margin of eye, but falling short 

 of distal margin of first antennular article; stylo- 

 cerite short, extending 0.45-0.50 of distance 

 between its proximal extremity and mesial base 

 of distolateral spine; latter rather long and sharp; 

 second antennular article with transverse row of 

 sharp spines near distal margin; antennular fla- 



FlGURE 21. — Hymenopenaeus nereus, syntype 2 23.5 mm cl, northwest of Islas Galapagos. Cephalothorax, lateral view. 



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