Pisidium milium

Pisidium milium is a species of very small freshwater bivalve in the family Sphaeriidae, the fingernail clams and pea clams.

Description
The 3.0- to 4.5-mm shell is tumid (swollen). It is more rectangular than other Pisidium species and has broad, swollen umbos which lie behind the midpoint. The surface (periostracum) is very glossy, with  irregular, concentric striae. The colour is yellow to pale brown.

Distribution
The native distribution of this species is Holarctic.


 * Czech Republic –in Bohemia, in Moravia, vulnerable (VU)
 * Slovakia
 * Germany – (Arten der Vorwarnliste)
 * Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden
 * Great Britain and Ireland