California Department of Fish and Wildlife
Aquatic Biological Assement

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Planorbidae

 

Key Characters Like the familes Lymnaeidae and Physidae, the Planorbidae also lack an operculum. They are distinguished from these other families by their planispiral (flattened coil-shaped) shells.
Tolerance unknown
Distribution CA, OR, WA, UT, NV, AZ, Baja