381 



The genus Lestrigonus and genera Hyperietta and Hyperionyx were 

 separated by Bowman from the genus Hyperia, to which they were affil- 

 iated by most authors as the subgenus Parahyperia. The type species 

 of the genus Lestrigonus, accepted as a monotype, was designated by 

 Milne-Edwards as L. fabrei. Unfortunately, the single type specimen has 

 been lost and its sketches and description are so scanty that it cannot be 

 identified as any of the modern species. 



The systematics of the genus is highly confused due to the great 

 sex and age variability of these crustaceans. Geographic variability and 

 scanty sketches and descriptions of the older species further compound 

 the problem. Various authors have attempted to revise the genus (or 

 subgenus Parahyperia) (Vosseler, 1901; Yang, 1960; and others) and 

 each has given his own scheme of synonymy or recognized the validity of 

 different species. The last revision of the genus Hyperia was by Bowman 

 (1973), but he also mentions that the division into species suggested by 

 him is far from indisputable. 



The genus includes six species (excluding L. fabrei). 



KEY TO SPECIES OF GENUS LESTRIGONUS 

 (after Bowman, 1973, with emendations) 



Females 



1 . Only somites I-III of pereon fused 3. 



— Not just somites I-III of pereon fused 2. 



2. Somites I-IV of pereon fused 4. 



— Somites I-V of pereon fused 6. L. bengalensis Giles. 



3. Antennal gland (at base of antennae II) acute, projecting downward 

 beyond mouth cone. Spine on distal margin of 6th segment of pere- 



opods VI-VII thin, without denticles 



1 . L. schizogeneios (Stebb.). 



— Antennal gland round, not extending to lower margin of mouth cone. 

 Spine on distal margin of 6th segment of pereopods VI-VII thick, 

 with one-two denticles on anterior margin 3. L. crucipes (Bov.). 



311 4. Length of head more than 1/2 its height. Antennal gland extends to 

 lower margin of mouth cone or projects beyond it. Telson extends to 



middle of basipodite of uropods III 



4. L. macrophthalmus (Vos.). 



— Length of head half or less* than half its height. Antennal gland not 

 extending to lower border or mouth cone. Length of telson 3/5 length 

 of basipodite of uropods III 5. 



Changed from Russian text by authors — ^Eds. 



