Pisidium supinum is a species of small freshwater clam, a pea clam, an aquatic bivalve mollusc in the family Sphaeriidae (the fingernail clams and pea clams.)

The shell of this species is 3 to 5 mm in size, and is roughly triangular in shape.

Its native distribution is Palearctic.

This Sphaeriidae-related article is a stub.

You can help Wikipedia by expanding it.