Pisidium conventus, the arctic-alpine pea clam, is a species of freshwater bivalve from the family Sphaeriidae.

shell is oval in shape and thin and fragile.

The colour is yellowish-white and the periostracum (surface) is silky with fine, concentric striation.

P. conventus is a relict of colder climatic periods found only in deep, cold, upland lakes.

This Sphaeriidae-related article is a stub.