 Although only 9 mm (range 7–11 mm) in length, this species is considerably larger than most "Pisidium" species, and has a fairly thick, concentrically ridged shell.Its shell is solid, glossy, triangular-oval in shape, and has broad but not prominent umbos often coated with a dull ferruginous deposit.Its colour is grey-white to brown, often with a greenish cast.