579 



The endopodites of uropods II and III are fused with the basipodites. 

 Type species: Schizoscelus omatus Claus, 1879. 



467 1. Schizoscelus ornatus Claus, 1879 (Fig. 252) 



Claus, 1879b: 21; 1887: 44; Stebbing, 1888: 1504; Spandl, 

 1927; 255. 



Length of sexually mature specimens 2.5-4 mm. 



The head is short, in length equal to the first three somites of the 

 pereon, its height is almost thrice the length. The pereon is bulged, high, 

 and longer than the pleon; the pleon is half as high as the pereon. 



The flagellum of antennae I in males is three-segmented; the 1st 

 segment has a bulged posterior margin bearing long thin setae arranged 

 in a fan; the 2nd and 3rd segments are straight and narrow. Antennae I 

 in females are similar in structure but their peduncle narrower than in 

 males. The basal segment of antennae II in males is 2/3 the length of 

 the following segment antennae II are folded zigzag four times. 



468 Pereopods I are simple; the 2nd segment is straight and equal in 

 length to the successive segments together; the 5th segment is shorter 

 than the two preceding together but broader and its posterior distal angle 

 may form a small pointed process; the 6th segment is longer than the 

 5th and its margins smooth; the claw is deeply curved. Pereopods II 

 have chelae; the 2nd segment is longer than in pereopods I; the 5th seg- 

 ment has a long posterior distal angle that reaches the base of the claw 

 and has a pointed tip, while the distal part of the anterior margin has 

 a few (generally three) denticles; the 6th segment is narrowly conical 

 and slightly curved. The 2nd segment of pereopods V has a bulged pos- 

 terior margin, slightly bulged anterior margin, and its width is half its 

 length; the 3rd-7th segments together are equal to the 2nd in length; the 

 4th segment is distally broadened and has a more bulged posterior mar- 

 gin; the 5th segment is narrower and longer, its posterior margin almost 

 straight, and the anterior slightly bulged in the distal part; the 6th seg- 

 ment is linear and longer than the 5th; the claw is thin and straight and 

 1/3 the length of the 6th segment. The 2nd segment of pereopods VI is 

 1 .5-2 times longer than in pereopods V, its maximum width occurring in 

 the proximal part, the anterior margin concave, with a low smoothened 

 tubercle in the middle, the distal margin evenly rounded, the posterior 

 margin markedly bulged in the proximal part but straight in the middle 

 and distal parts, and the fissure on the inner surface of the segment very 

 long; the distal segments together are 1/3 the length of the 2nd segment; 

 the 4th segment has an anterior distal process that reaches the middle of 

 the 5th segment; the 6th segment is notably narrowed; the claw is rudi- 

 mentary. Pereopods VII have a full complement of segments; the 2nd 

 segment in females is almost linear, its width 1/3 its length; the 4th and 

 5 th segments are equal to each other but the 6th is shorter; the claw is 



