Pisidium personatum

Pisidium personatum is a species of freshwater bivalve from the family Sphaeriidae.

Pisidium personatum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. personatum
Binomial name
Pisidium personatum Malm, 1855

Description

The 2.5-3.5 mm shell is a characteristic round-regular oval shape. It has centrally placed low, rounded umbos. The surface (periostracum) is dull or silky with very fine irregular concentric striations. The colour is yellowish to greyish but it is invariably coated in a red-brown to dark brown deposit.

Distribution

Its native distribution is European-Siberian.

• Czech Republic – in Bohemia, in Moravia,^[1] least concern (LC)^[2]
• Germany – distributed in all of Germany but in 5 states in red list (Rote Liste BRD).^[3]
• Nordic countries: Denmark, Faroes, Finland (near threatened^[4]), Iceland, Norway and Sweden^[5]
• Great Britain and Ireland^[6]