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.
Source: wiktionary
Telson
Synonyms for "telson"
Ranked by relevance and common usage.
Sample sentences
3 total sentences available.
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.
Source: wiktionary
The two documented examples of telson abnormalities are on juvenile moults (Fig. 2a, b).
Source: wiktionary