Any of several freshwater bivalve mollusks of the genera Anodonta and Unio, found in the central United States, that burrow in the sand or mud of lakes and streams.

• 淡水蚌发现于美国中部的无齿贝属和珠蚌属几种淡水双壳软体动物的一种，在湖和河中的沙中或泥中挖洞