PEREZ FARFANTE: AMERICAN SOLENOCERID SHRIMPS 



FIGURE ll. — Hymenopenaeus aphoticus, 6 14.5 mm cl, south of Isla Aves, eastern Caribbean. A, Petasma (extended), dorsolateral 

 view. B, Ventral view. C, Right appendices masculina and interna, dorsolateral view. D, Ventromesial view. 



those podomeres and as much as 0.15 length of 

 merus. Pereopods increasing in length from first 

 to fifth. First pereopod with rather inconspicuous 

 spine on basis, and long slender spine on ischium; 

 second pereopod with small spine on basis. In 

 female, coxa of third pereopod produced into sub- 

 trapezoidal plate, latter broadest mesially, dis- 

 posed almost at right angle to podomere, and bear- 

 ing minute anteromesial tooth in juvenile. In both 

 sexes, tooth present on anteromesial angle of coxa 

 of fifth pereopod, considerably stronger in male 

 than in female, in latter tooth minute and borne 

 on rounded coxal plate. 



Abdomen with middorsal carina from fourth 

 through sixth somites, posterodorsal margin of 

 fourth and fifth with short median incision; sixth 

 somite about 1.8 times as long as high, bearing 

 small, sharp spine at posterior end of carina and 

 pair of minute spines posteroventrally. Telson 

 with rather shallow median sulcus extending 

 posteriorly to level of base of lateral spines, and 

 flanked by well-developed ridges; terminal por- 

 tion length 5-6 times its basal width; lateral 

 spines length 1.4-1.7 times basal width of termi- 

 nal portion. Mesial ramus of uropod falling short 

 of, or slightly overreaching, apex of telson; lateral 

 ramus overreaching mesial ramus by as much as 

 0.25 of its own length, and armed with small, 

 slender distolateral spine, falling slightly short of, 



or barely overreaching, contiguous margin of 

 ramus. 



Petasma (Figure 11A, B) with row of cincinnuli 

 occupying proximal 0.4 of median line, and entire 

 terminal margin armed with spines; ventro- 

 median lobule distally cleft forming two moder- 

 ately long processes: mesial one subtrapezoidal 

 and armed with conspicuous spines mesially and 

 minute ones distolaterally, lateral process sub- 

 elliptical, raised inwardly in strong prominence, 

 and produced proximally in rather large auricular 

 process armed with marginal spinules; distal flap 

 of ventrolateral lobule free, extending as far dis- 

 tally as lateral process, and only slightly turned 

 outward; ventral costa forming low prominence 

 at, and imperceptibly merging with, base of 

 flap. 



Appendix masculina (Figure 11C, D) strongly 

 elevated along mesial portion and with proximal 

 part produced laterally into rounded, flattened 

 lobe; distal part narrowing and bearing lateral 

 row of setae continuous with apical tuft of long 

 setae. Appendix interna elongate-ovate, extend- 

 ing slightly farther distally than appendix mas- 

 culina, and armed with apical tuft of setae. 

 Ventrolateral spur short, its length not greater 

 than 0.5 that of appendix masculina. 



Thelycum (Figure 12) similar to that of H. 

 debilis (see above). 



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