Unionid Mollusks 
81 
Fig. 17-22. Anodontini (Unioninae), localities in parentheses. 17-18, Strophitus 
undulatus: 17 (21), 18 (14). 19-20, Alasmidonta varicosu: 19 (14), 20 (24). 21, A. 
undulata (25). 22, Lasmigonia subviridis (21). Scale line = 10 cm 
Remarks'. This species is less common in the upper Cape Fear than in 
the Tar system and Piedmont part of the Neuse system, where it was 
taken at 13 and 18 sites, respectively (Walter 1956, Clarke 1983). In this 
study only one valve was taken, in the headwaters of Bear Creek. John- 
son (1970) reported localities in the Neuse, Tar, Yadkin, and Catawba 
basins, along with one from the Cape Fear River at Kinnon, near Fay- 
etteville. Clarke (1985), however, considered the Catawba population as 
representing L. decorata (Lea) and did not record either species from 
the Yadkin. Thus, L. subviridis is widespread on the Atlantic slope from 
New York to the Cape Fear basin, and it is also known from the New 
and Greenbrier rivers of the Kanawha drainage in North Carolina and 
West Virginia (Johnson 1970, Burch 1975). It prefers small streams and 
tributaries, and tends to avoid large rivers (Clarke 1985). 
