PEREZ FARFANTE: AMERICAN SOLENOCERID SHRIMPS 



FIGURE 5. — Hymenopenaeus debilis, 9 19.5 mm cl, off Cape Kennedy, Fla. A, Mandible. B, First maxilla. C, Second maxilla. 

 D, First maxilliped. E, Second maxilliped. f, Rudimentary arthrobranchia. f 1 , Enlargement of /"(all from left side). 



ity and mesial base of distolateral spine; latter 

 long, slender, and sharp. Antennular flagella very 

 long and considerably unequal in length, ventral 

 2.15 and dorsal 7.5 times carapace length in 

 shrimp 7 mm cl, and 1.7 and 5.5 times, respec- 

 tively, in shrimp 10 mm cl. Scaphocerite over- 

 reaching antennular peduncle by as much as 0.25 

 of its own length; lateral rib ending in slender 

 spine, falling short to slightly surpassing distal 

 margin of lamella. Antennal flagellum incom- 

 plete in all specimens examined; however, in one 

 individual about 35 mm tl, antennal length 155 

 mm, thus not less than 4.4 times total length of 

 shrimp. 



Mandibular palp (Figure 5A ) reaching to about 

 level of distal 0.2 of carpocerite; proximal article 



2.4 times as long as wide; distal article consider- 

 ably shorter and narrower than proximal, and 

 tapering to blunt tip. First and second maxillae, 

 and first and second maxillipeds as illustrated 

 (Figure 5B-E, virtually identical throughout 

 genus); somite VII bearing rudimentary arthro- 

 branchia at base of first maxilliped ( Figure bDf-p-). 

 Third maxilliped overreaching antennular pedun- 

 cle by length of dactyl and propodus; length of 

 dactyl about 0.7 that of propodus. 



First pereopod, stoutest of five, reaching distal 

 end of carpocerite or surpassing it by as much as 

 length of dactyl. Second pereopod overreaching 

 antennular peduncle by at least half length of 

 dactyl or by entire propodus. Third pereopod ex- 

 ceeding antennular peduncle by length of dactyl, 



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