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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，發現於美國中部的無齒貝屬和珠蚌屬幾種淡水雙殼軟躰動物的一種，在湖和河中的沙中或泥中挖洞。