Pisidium milium

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

Pisidium milium
Drawing of the left valve internal view of Pisidium milium
Drawing from Dansk Fauna showing the valve articulation and the rectangular form
Conservation status
Least Concern  (IUCN 3.1)(Global, Europe)
Critically endangered, possibly extinct  (IUCN 3.1)[1] (North & Pan-Africa)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. milium
Binomial name
Pisidium milium Held, 1836

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,^[2] vulnerable (VU)^[3]
• Slovakia^[2]
• Germany – (Arten der Vorwarnliste)^[4]
• Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden^[5]
• Great Britain and Ireland^[6]