Pisidium obtusale

Pisidium obtusale is a species of freshwater bivalve from family Sphaeriidae.

Pisidium obtusale
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. obtusale
Binomial name
Pisidium obtusale (Lamarck, 1818)

Description

The 2.5–3.5mm. shell is very tumid (swollen). It is an angular-oval shape with broad, rounded umbos which are behind the midpoint. The surface (periostracum) 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.

• Czech Republic – in Bohemia, in Moravia,^[1] near threatened (NT)^[2]
• Germany – (Arten der Vorwarnliste)^[3]
• Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden^[4]
• Great Britain and Ireland^[5]