California Department of Fish and Wildlife
Aquatic Biological Assement

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Sphaeriidae

 

Key Characters Very common, widespread, also known as "pea," "pill" or "fingernail" clams, or "seed shells." Typically less than 10mm. Thin, fragile shells. Growth rings are present but faint.
Tolerance unknown
Distribution CA, OR, WA, UT, NV, AZ, Baja