388 



316 The 2nd segment of pereopods I has a sharply humped anterior mar- 



gin; the distal process of the 5th segment bears five-six spines; the 6th 

 segment in females bears one, in males two spines on the anterior mar- 

 gin. The distal process of the 5th segment of pereopods II extends to 

 midlength of the 6th segment; the 6th segment in females bears one, in 

 males two spinules on the anterior margin. The claw of pereopods V is 

 1/4-1/3 the length of the 6th segment and 3/4 the length of the claw of 

 pereopods VI and VII. The 6th segment of pereopods VI and VII has 

 one spine on the distal margin. 



The triangular telson has an acute apex in females and constitutes 

 half, in males less than half the length of the basipodite of uropods III. 



Notes: This species is quite close to L. latissimus but is distinguished 

 from it by smaller size, spherical head, and that the antennal gland cov- 

 ers the epistome to a lesser extent. Moreover, the claw of pereopods V 

 and the basipodite of the uropods in L. macrophthalmus are relatively 

 longer. 



Distribution: A circumtropical species living in the warmest water 

 regions of all the three oceans in the upper 100 m layer. 



5. Lestrigonus latissimus (Bovallius, 1889) (Fig. 166) 



Bovallius, 1889: 299 {Hyperia); Chevreux and Page, 1925: 

 404 (Hyperia); Stephensen, 1928: 590 (Hyperia); Bowman, 1973: 

 50. — hydrocephala Vosseler, 1901: 74 (Hyperia); Stephensen, 1924: 91 

 (Hyperia). — bengalensis (non Giles, 1887); Shoemaker, 1945a: 238; 

 1948: 12 (Hyperia). 



Length of sexually mature males 3-4 mm, of females 2-3 mm. 



The length of the head in females is less than half the length of the 

 fused somites of the pereon. In females somites I-IV of the pereon are 

 fused, in males, somites I-Il. The antennal gland is round at the apex 

 and does not extend to the lower margin of the mouth cone. 



The mandibles have ten denticles on the cutting edge. The outer 

 lobes of the maxillipeds are thin, with three apical setae and two-four 

 setae along the inner margin; the inner lobes have two very short apical 

 spinules. 



Pereopods I have 2nd segment with a humped anterior margin; the 

 6th segment has one-two spines on the anterior margin. The distal pro- 

 cess of the 5 th segment of pereopods II reaches half the length of the 

 6th segment; the 6th segment has two spines on the anterior margin. 

 The claw of pereopods V is 1/5-1/4 the length of the 6th segment and 

 1/3 the length of the claws of pereopods VI and VII. The 6th segment 

 of pereopods V-VII has one spine on the distal margin. The triangular 

 telson in females is 3/5 the length of the basipodite of uropods III, in 

 males 1/2. 



