Pisidium subtruncatum

Pisidium subtruncatum is a species of pill clam, a minute freshwater bivalve in the family Sphaeriidae.

Pisidium subtruncatum
Drawing of the left valve internal view of Pisidium subtruncatum
Drawing of the right valve internal view of Pisidium subtruncatum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. subtruncatum
Binomial name
Pisidium subtruncatum Malm, 1855

Description

The 2.7 – 4 mm shell is moderately tumid (swollen). In shape it is a strongly oblique oval. The umbos are prominent and well behind the middle. The surface is silky glossy with fine, irregular ribbing. In colour it is whitish to greyish.

Distribution

Its native distribution is Holarctic.

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