419 



340 



Fig. 1 80. Phronima solitaria Guerin-Meneville 

 ($,— after Vosseler, 1901; Py,— after Shih, 1969) 



341 segment approximately 1.5 times its width, the anterior margin is straight 

 in males and slightly bulged in females, the posterior margin bulged, the 

 proximal angle not produced, and the maximum width of the segment 

 occurs in the distal part; the anterior distal tooth is strong, curved, in 

 females reaches, in males does not reach the level of the tip of the 

 medial protuberance; the medial denticle of the distal margin is absent in 

 females, in males developed and separated from the medial protuberance 

 by a shallow notch; the medial protuberance in females is strong, high, 

 triangular, and has a tuberculate posterior margin; in males it is not high 

 and has three-four poorly discernible tubercles; the 6th segment has a 

 weakly developed protuberance in the middle of the anterior margin, and 

 in a bent position extends beyond the anterior margin of the 5th segment 

 by not more than 1/3 its length in females and 1/4 its length in males. 

 The rami of the uropods are approximately equal in length. 



Notes: Phronima solitaria is close to P. atlantica in body propor- 

 tions, but in structure of the 5th segment of pereopods V to P. sedentaria; 

 however, unique morphological features enable identification of even 

 juvenile crustaceans. The possible hybrid nature of this crustacean has 

 also been suggested (Shih, 1969). However, relatively recently the same 

 author (Shih, 1971a) identified and described the male P. solitaria and 

 confirmed the independent status of the species. The males of this species 



