Unionid Mollusks 
79 
11 
Fig. 11-16. Anodontini (Unioninae), localities in parentheses. 11-14, Anodonta 
cataracta: 11 (17), 12 (14), 13 (1), 14 (6). 15-16, A. imbecilis (both 26). Scale line 
= 10 cm. 
reported two localities in the upper Neuse, but Johnson (1970) did not 
include any from this basin among his three North Carolina records — 
one each from the Yadkin, Catawba, and Cape Fear watersheds. In the 
Tar, Clarke (1983) encountered living specimens and empty valves at 
two and three stations, respectively, and found a thriving population in 
the impoundment upstream from Rocky Mount, Nash County. Ano- 
donta imbecilis may be confused with A. couperiana, which also has 
flattened umbos and is known from Greenfield Lake (site N), but the 
former has a straight ventral margin and the latter a broadly curved 
profile. 
