421 



which is shorter than pleon somite I, whereas in other species of Phron- 

 ima this relation is reversed. In structure of pereopods V, P. stebbingi is 

 close to P. atlantica: the posterior distal angle of the 2nd segment has a 

 small but well-defined triangular process; the length of the 4th segment 

 in females is more than its width, while in males the length and breadth 

 are equal, and the posterior margin is bulged, almost semicircular; the 5th 

 segment in females is approximately triangular, its length more than its 

 width, while in males the length and width of the 5th segment are equal 

 and the posterior margin is highly bulged proximally; the anterior distal 

 tooth is medium in size; the medial tooth and the medial protuberance 

 of the distal margin are close-set. 



Uropods II are much (in females almost half) narrower and shorter 

 than the rest and with a small endopodite. 



Distribution: Found in tropical waters of the three oceans and in the 

 western part of the Mediterranean Sea. It is most common in the Atlantic 

 Ocean and in the eastern equatorial Pacific Ocean. 



5. Phronima curvipes Vosseler, 1901 (Fig. 182) 



Vosseler, 1901: 27; Pirlot, 1929: 114; Shih and Dunbar, 1963: 2; 

 Shih, 1969: 26; Laval, 1970: 51.— colletti Stephensen, 1924: 126 (part.). 



Length of adult females 8.5-17 mm, of males 6.0-9.2 mm. 



The antennae are well developed in males. The flagellum of 

 antennae I is five- to seven-segmented, in antennae II seven- to nine- 

 segmented and equal to antennae I in length. 



Pereopods V have an S-shaped 2nd segment, which is particularly 

 noticeable in females; the posterior distal angle of this segment extends 

 behind and is acute; the 4th segment in females is almost spherical, in 

 males the width of the segment is more than its length; the 5th segment 

 is trapezoid, in females its length is more than its width, in males the 

 relation is reversed: the maximum width along the distal margin is more 

 than the length; the posterior proximal angle of the 5th segment projects 

 roundly, particularly in males in which the length of the posterior margin 

 is more than twice the length of the anterior margin; the anterior distal 

 tooth is strong, slightly curved and exceeds the height of the medial 

 protuberance of the distal margin; the medial protuberance is triangular 

 in females, more or less roundish in males, and uniformly denticulate 

 posteriorly; the medial denticle is developed only in males. The 6th 

 segment of pereopods V in females passes slightly beyond the anterior 

 margin of the 5th segment, in males is almost the same length as the 

 distal margin of the 5th segment; a low protuberance is noticeable in the 

 distal part of the 6th segment. 



Uropods II are appreciably narrower and shorter than the rest, with 

 a very short endopodite, which in males is at least half the length of the 

 exopodite. 



