402 



the spoon-shaped process of the 5th segment and the posterior margin 

 of the 6th segment. Pereopods III-VII have strong claws devoid of 

 ornamentation. Pereopods III- IV are approximately equal in length, 

 pereopods V are distinctly shorter, and pair VII are somewhat longer. 



Type species: Hyperia macrodactyla Stephensen, 1924. 



Hyperionyx is the only genus in Hyperiidae in which the three 

 somites of the pereon are fused in both sexes. Like Themistella, this 

 genus too has a very short telson; as in Hyperioides, antennae II in 

 females are relatively longer but the cone of the antennal gland is small. 

 As for other characters, Hyperionyx differs significantly from the afore- 

 mentioned genera. 



The genus includes just one species. 



1. Hyperionyx macrodactylus (Stephensen, 1924) (Fig. 174) 



Stephensen, 1924: 90 (Hyperia); Yang, 1960: 35; Bowman, 1973: 71. 

 Very minute crustaceans, 2-3 mm in length. 



The pereon is longer than the pleon. The head in females is approx- 

 imately the same length as the fused somites of the pereon. 



Fig. 174. Hyperionyx macrodactylus (Stephensen). 



