PEREZ EARFANTE: AMERICAN SOLENOCERID SHRIMI'S 



as much as entire propodus. Fourth pereopod 

 exceeding carpocerite by almost length of dactyl 

 and sometimes by as much as length of dactyl 

 and 0.15 that of propodus. Fifth pereopod reaching 

 beyond antennular peduncle by length of dactyl 

 and 0.6 to entire length of propodus. Order of 

 pereopods in terms of their maximal anterior 

 extensions: first, second, fourth, third, and fifth. 

 First pereopod bearing very long spine on disto- 

 mesial extremity of basis, long one on that of 

 ischium, and relatively small spine almost at mid- 

 length of merus. Second pereopod with long spine 

 on basis. In female, coxa of third pereopod pro- 

 duced mesially into rather short densely setose 

 plate; coxa of fourth pereopod bearing narrow 

 plate. In both sexes, coxa of fourth and fifth pereo- 

 pods bearing conspicuous anterior spine. 



Abdomen with strong middorsal carina from 

 third through sixth somites, carina rounded on 

 third, forming keel from fourth posteriorly; 

 posterodorsal margin of third, fourth, and fifth 

 with long median incision; sixth somite length 

 about 1.3 times maximum height, bearing sharp 

 spine at posterior end of keel and minute spines 

 at posteroventral angles. Telson with median 

 sulcus deep anteriorly, progressively shallower 

 posteriorly, disappearing just before reaching 

 base of lateral spines; terminal portion length 

 3.3-4.0 times basal width; lateral spines short, 

 1-1.4 times basal width of terminal portion. 

 Mesial ramus of uropod reaching to, or slightly 

 surpassing, apex of telson; lateral ramus over- 

 reaching mesial by as much as 0.2 of its own 

 length, and armed with minute distolateral spine, 

 reaching distal margin of ramus. 



Petasma (Figure 54A, B) cincinnulate along 

 proximal 0.70 of median line; broad distal part 

 of ventromedian lobule produced into blunt, disto- 

 mesial projection, its lateral part turned strongly 

 inward; entire terminal margin of lobule spinu- 

 lous; distal part of ventrolateral lobule heavily 

 sclerotized, forming plate, border adjacent to 

 ventral costa bearing emargination delimiting 

 basal part from short, broadly subelliptical ter- 

 minal part; latter inclined toward, and partially 

 covered by, ventromedian lobule, and armed with 

 spinules along entire distal margin; ventral costa 

 with distal part free from, and falling short of, 

 contiguous plate, its distal margin bearing very 

 minute spinules. 



Appendix masculina (Figure 54C, D) with prox- 

 imal part broad, produced mesially into thickened 

 lobe, and bearing long setae along lateral margin; 



distal part narrow, directed strongly laterally, 

 and bearing apical tuft of long setae. Appendix 

 interna shorter than appendix masculina, nar- 

 row, and lacking setae. Ventrolateral spur large, 

 paddlelike. 



Thelycum (Figure 55) with median protuber- 

 ance on sternite XIV roughly elliptical, low, 

 markedly less elevated than prominent setose, 

 paired convexities of sternite XIII; median ridge 

 of latter long, lacking tooth, sometimes ending 

 in small knob at one or both extremities. 



Maximum size-Female (holotype), 25.5 mm cl, 

 100 mm tl; male, 18.5 mm cl, 72.5 mm tl (Kubo 

 1949). Largest male examined by me, 14 mm cl, 

 about 64 mm tl. 



Geographic and bathymetric ranges-Madagascar 

 (off northwest coast) through the Indo-West Pacif- 

 ic to Hawaii (Figure 16), in depths between 180 

 and 500 m (Figure 9). The few records available 

 are from scattered localities. 



FIGURE 55.— Hadropenaeus lucasii, ? 19.5 mm cl, Pailolo 

 Channel, Hawaiian Islands. Thelycum, ventral view. 



329 



