Pisidium obtusale Pisidium obtusalespecies of freshwater bivalve from family Sphaeriidae .Description The 2.5–3.5mm. shell is very tumid. It is an angular-oval shape with broad , rounded umbos which are behind the midpoint. The surface is glossy with fine concentric striae. Numerous pores are visible inside the shell. The colour is whitish to yellowish often coated with a red-brown deposit.Distribution Its native distribution is Holarctic .
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