California Department of Fish and Wildlife
Aquatic Biological Assement

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Unionidae

 

Key Characters Pearly mussles, found in lotic (river) or lentic (lake) environments. Shell enlongated, oval, subtiangular, or subcircular. Ligament external. Lack true cardinal teeth but pseudorcardinal teeth are well-developed in most species.
Tolerance unknown
Distribution CA, OR, WA, UT, NV, AZ, Baja