82 



72 



Distribution: Tropical regions of the Atlantic, Indian, and pacific 

 oceans. Possibly circumtropical in distribution. It has been found in 

 catches from depths of 1 ,900-4,500 m (Indian Ocean) and in through 

 catches from depths of several thousand meters to the surface. 



Lanceola clausi gracilis Vinogradov, 1956 (Fig. 18) 



Vinogradov, 1956: 196, 1957: 195, 1962: 10. 



Length of sexually mature specimens 9-1 1 mm. 



The basic differences from the typical form are: a better propor- 

 tioned body with cylindrical, almost unbulging pereon and broad pleon, 

 great width of the urosomal somites, and a much longer telson, which 

 almost reaches the tip of the basipodite of uropods III. Moreover, in pere- 

 opods VII the 5th segment is somewhat shorter than the 4th while in the 

 typical form they are equal in length. Finally, in sexually mature males 

 of L. clausi gracilis the proximal segment of the flagellum of antennae I 

 is particularly broad and richly pubescent on the anterior margin, which 

 is not characteristic of males of the typical form. 



Psi^ 



71 



Fig. 18. Lanceola clausi gracilis Vinogradov (after Vinogradov, 1957). 



