California Department of Fish and Wildlife
Aquatic Biological Assement

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Physidae

 

Key Characters Lacks an operculum like the Lymnaeidae and Planorbidae. It is distinguished from the former by the fact that its shell is sinistral rather than dextral, and from the latter by the fact that its shell is not planispiral.
Tolerance unknown
Distribution CA, OR, WA, UT, NV, AZ, Baja