401 



The process of the 5th segmet of pereopods I is very slightly shorter 

 than half the length of the 6th segment; the 6th segment is longer than 

 the body of the 5th segment, its anterior margin convex and smooth, 

 the posterior margin straight and finely denticulate. Pereopods II are 

 somewhat longer than pereopods I; the distal process of the 5th segment 

 is 3/4 the length of the posterior margin of the 6th segment; the narrowly 

 conical 6th segment is somewhat longer than the 5th segment; the claw is 

 almost straight and twice shorter than the 6th segment. Pereopods IV are 

 327 somewhat longer than pereopods III; the 2nd segment broadens distally; 

 the 5th segment of pair III is shorter than in pair IV; the 6th segment is 

 narrow, linear, and has short setae along the posterior margin; the claw 

 is slightly curved and 1/3 the length of the 6th segment. Pereopods V 

 are longer than the other pairs; the 5th segment is longer than the 3rd 

 and 4th together; the narrow 6th segment is equal to the 4th and 5th 

 together; the 4th-6th segments bear short equidistant setae along the 

 anterior margin; the claw is approximately 1/6 the length nf the 6th 

 segment. Pereopods VI and VII are similar in structure; in contrast to 

 pair V the 6th segment is shorter than the 4th and 5th together; the claw 

 is 1/4 the 6th segment in length and appears as if broken in the distal 

 part. 



The lower posterior angle is broadly rounded in epimerons I and II, 

 in epimeron III stretched and rounded at the apex. The basipodites of the 

 uropods are twice longer than the rami; the rami are narrowly lanceolate 

 and have an acute apex. The roundish-triangular telson is equal in length 

 and width, its length 1/5 that of the basipodite of uropods III. 



Distribution: Tropical (Canary Islands) and equatorial (Barbados 

 Island, Bay of Guinea) regions of the Atlantic Ocean, the Arabian Sea, 

 and tropical part of the Pacific Ocean (central regions of the Gulf of 

 California, coastal regions of Nicaragua and Guatemala). 



It is a surface species. 



13. Genus Hyperionyx Bowman, 1973 



Bowman, 1973: 71. 



The head is spherical and the eyes occupy most of its surface. 

 Somites I-III of the pereon are fused in both sexes. 



Antennae I in females are two-segmented; antennae II are one- 

 segmented and thinner and slightly shorter than antennae I. The 

 mandibular palp is absent in females. Maxillae I have an apical spine 

 on the outer lobe. The outer lobes of the maxillipeds are large, broadly 

 oval, and almost devoid of ornamentation, while the inner lobes are 

 narrowly triangular and without ornamentation. The coxal plates are 

 fused with the somites of the pereon. Pereopods I have a subchela; 

 the 2nd segment is broadened. Pereopods II have a chela formed from 



