Pisidium subtruncatum is a species of pill clam, a minute freshwater bivalve in the family Sphaeriidae.
The 2.7 – 4 mm shell is moderately tumid (swollen). In shape it is a strongly oblique oval. The umbos are prominent and well behind the middle. The surface is silky glossy with fine, irregular ribbing. In colour it is whitish to greyish.
Its native distribution is Holarctic.Show More