“…Polymesoda caroliniana, the Carolina marsh clam, is a member of the predominantly freshwater Corbiculidae and its reported range is from Virginia to Texas (Andrews andcook 1951,TabbandMoore 1971,Olsen 1973,Olsen 1976, Duobinis-Gray and Hackney 1982, Hackney 1983, Hackney 1985a. Cold intolerance may be the primary factor limiting its northern distribution (Hackney 1985b). It is found in a wide variety of shallow water or intertidal habitats, including salt marshes, brackish marshes, open river shores, mud banks, rock crevices and peat bogs, and is often associated with the plants Spartina alternifora, Juncus roemerianus, Taxodium distichum and Rhizophora mangle (Andrews and Cook 1951, Tabb and Moore 1971, Olsen 1973, Olsen 1976, Duobinis-Gray and Hackney 1982, Hackney 1983, Hackney 1985a.…”