319 



rami, the telson is small or medium in size, but always shorter than the 

 basipodite of uropods III. 



The family Hyperiidae was separated in 1852. Bovallius (1889) gave 

 a detailed description of each of the species known at that time. In spite 

 of the fact that a number of researchers worked on the taxonomy of 

 the family Hyperiidae (Vosseler, 1901; Stephensen, 1924; yang, 1960; 

 and others), it was not subjected to a serious revision for a long time. 

 Consequently, the synonymy of the whole family and the main genera 

 (first and foremost, of all Hyperia and closer genera) became highly 

 confused, a situation further aggravated by sharply expressed sexual and, 

 in some groups, age-related dimorphism. The genera Parathemisto and 

 Hyperia were revised by Bowman in 1960 and the whole family in 

 1973. In the process, with adequate reasons, a number of new genera 

 were identified and the composition of other genera was changed. We 

 have followed the basic generic characteristics proposed by Bowman and 

 subscribe to his diagnoses. 



The contemporary family Hyperiidae includes 14 genera. 



KEY TO GENERA OF FAMILY HYPERIIDAE 



1. Eyes large, occupy almost entire lateral surface of head 2. 



— Eyes small, less than 1/4 height of head 8. Bougisia Laval. 



2. All somites of pereon free. Coxal plates free, not fused with somites 

 of pereon 3. 



— Somites I and II, sometimes even other somites of pereon completely 

 or only dorsally fused. Coxal plates fused with somites of pereon . . 

 ....9. 



3. Interantennal lobe almost not developed. Eyes distinctly faceted. 

 First segment of flagellum of antennae I in females conical, almost 

 straight 4. 



— Head with highly developed interantennal lobe. Eyes not faceted. 

 First segment of flagellum of antennae I in females petaloid, curved 

 like a boomerang 7. Pegohyperia Barn. 



4. Body and extremities smooth, glabrous. Coxal plates flat 5. 



— Body and at least pereopods I and II covered with thin short setae. 



Anterior coxal plates with projecting pectinate fold 



3. lulopis Bov. 



261 5. Distal process of 5th segment of pereopods I and II almost identical 

 in structure and length 6. 



— Distal process of 5th segment of pereopods II better developed than 

 in pereopods I 7. 



6. Distal process of 5th segment in pereopods I and II knife-shaped, 



constricting distally and stretched into a cusp 



4. Hyperoche Bov. 



