458 



371 The head is more rounded in females than in males. Antennae II of 



males have a zigzag folded flagellum in which the length of the distal 

 section is 1/3-1/2 that of the preceding section; the apical segment is 

 very short. 



Pereopods I are simple. The 5th segment of pereopods II has a pos- 

 terior distal process capable of forming a chela. The 2nd segment of 

 pereopods V and VI is strongly broadened. The 2nd segment of pere- 

 opods V is oval and the 3rd segment articulates with it subapically at 

 some distance from the distal margin; the 4th-6th segments have a den- 

 ticulate anterior margin. The 2nd segment of pereopods VI is somewhat 

 larger than in pereopods V, narrowed distally, its anterior margin concave 

 and the posterior margin bulged; the 3rd segment articulates with the 2nd 

 subapically and from this place the 2nd segment extends as two distal 

 lobes, of which the anterior is concave with a blunt distal margin and the 

 posterior one has a convex margin; the 4th segment has a distal process; 

 the 4th-6th segments have a serrated anterior margin. Pereopods VII have 

 a triangular 2nd segment and two very short distal segments. In some 

 cases, with anomalous development, the number of distal segments may 

 be more — up to five. The last urosomite is longer than wide. 



Type species: Parapronoe crustulum Claus, 1879. 



The genus includes four species. 



KEY TO SPECIES OF GENUS PARAPRONOE 



1. Telson approximately same length as uropods 2. 



— Telson not longer than half length of uropods III 3. 



2. Anterior margin of distal process of 5th segment of pereopods II 



concave. Telson 1/2 to 2/3 length of last urosomite 



1 . P. crustulum Claus. 



— Anterior margin of distal process of 5th segment of pereopods II 

 straight or slightly convex. Telson same length as last urosomite or 

 slightly shorter 3. P. campbelli Stebb. 



3. Distal process of 5th segment of pereopods II not extending beyond 

 middle of 6th segment. Last (geminate) urosomite 1.2-1.3 times 



longer than wide. Rami of uropods III broadly oval 



2. P. parva Claus. 



— Distal process of 5th segment of pereopods II reaching 3/4 length of 

 6th segment. Last urosomite almost twice longer than wide. Rami of 



uropods III narrowly oval, almost lanceolate 



4 P. elongata Semenova. 



1. Parapronoe crustulum Claus, 1879 (Fig. 199) 



Claus, 1879b: 31; 1887: 55; Stebbing, 1888: 1530; Shoemaker, 

 1945a: 246. — atlantica Bovallius, 1887a: Al.—clausi Stebbing, 1888: 



