427 



The first pair of gills are less reduced than in P. colletti although 

 they are slightly smaller in size than the second pair, being nearly 3/4 

 its length and 4/5 its width. 



The basipodite of the uropods have parallel sides. The rami of 

 uropods II are approximately equal in length. 



Notes: This species is very close to P. colletti and for a long time 

 was considered a geographic variety of the latter; however, Laval (1970) 

 convincingly proved the independent status of the species P. bucephala. 



Distribution: Northern and western parts of the Indian Ocean and 

 also Indo-West Pacific and east part of the Pacific (Nasca ridge). 



2. Genus Phronimella Claus, 1872 



Claus, 1872: 467; Streets, 1882: 7; Stebbing, 1888: 1361; Bovallius, 

 1889: 386; Vosseler, 1901: 39; Chevreux and Page, 1925: 399; Pirlot, 

 1929: 116; Shih, 1969: 30; Bowman and Gruner, 1973: 3S.—Archylonix 

 Streets, 1877: 130. 



The body is very thin with long, thin extremities. The head is conical 

 and less high than in the species of the genus Phronima; a very short 

 neck is formed at the articulation with the pereon, which is quite distinct 

 in mJes (in Phronima the posterior margin of the head is straight from 

 the crown to the oral sinus but sometimes curved). 



The pereon is the same length as the pleon; the height of the pereon 

 somites is half that of the head. The first two pereon somites are partly 

 fused on the dorsal side. Somite VII is shorter than somite I of the 

 pleon. Pereopods III- IV are exceptionally long and thin. Pereopods V 

 have a weakly developed subchela; the 5th segment is elongated, weakly 

 broadened, and together with the movably articulated 6th segment forms 

 a clasping structure. The anterior margin of the 2nd-5th segments 

 bears coarse denticles which are particularly well developed on the 5th 

 segment. 



Uropods I and III are well developed, with narrow basipodites and 

 acute rami. Uropods II in males are very small, in females represented 

 generally by a small unsegmented appendage. The telson is very small, 

 semicircular, and shifted to the dorsal side of the last urosomite so that 

 distally it does not project beyond its limits. 



Type species: Phronima elongata Claus, 1862. 



1. Phronimella elongata (Claus, 1862) (Fig. 186) 



Claus, 1862: 193 {Phronima); 1871: 149; Stebbing, 1888: 1362 

 Bovallius, 1889: 398; Vosseler, 1901: 40; Stephensen, 1924: 130 

 Chevreux and Page, 1925: 399; Pirlot, 1930: 116; Barnard, 1932: 286 

 Shih and Dunbar, 1963: 2; Shih, 1939: 30.— hamatus Streets, 1877: 131 

 (Anchylonix). — hippocephala Giles, 1867: 217. 



