Telson

Although Crangonya evidently comes very close to Niphargus, it appears to be a good genus, and to differ constantly from Niphargus in the more robust body and in the telson, which is always entire and never cleft as in Niphargus.

The basic number of segments in the abdomen is eleven plus the postsegmental telson which bears the anus, although Matsuda (1976) regards the telson as a twelfth segment.

The two documented examples of telson abnormalities are on juvenile moults (Fig. 2a, b).