Pisidium nitidum

Pisidium nitidum, the shining pea clam, is a species of small freshwater clam, an aquatic bivalve mollusc in the family Sphaeriidae, the pea clams and fingernail clams.

Pisidium nitidum
Drawing of the left valve external view of Pisidium nitidum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. nitidum
Binomial name
Pisidium nitidum Jenyns, 1832

Description

The 3 – 4 mm. shell is slightly tumid (swollen). In shape it is regular-oval with low umbos slightly behind the midpoint. The umbonal area is demarcated by three concentric furrows. The surface (periostracum) is very glossy, with prominent irregularly spaced concentric striae. The colour is yellowish.

Distribution

Its native distribution is Holarctic.

• Czech Republic – in Bohemia, in Moravia,^[1] - least concern (LC)^[2]
• Slovakia^[1]
• Germany – distributed in whole Germany, endangered (gefährdet) in Bavaria and Arten der Vorwarnliste in Brandenburg.^[3]
• Nordic countries: Denmark, Faroes, Finland, Iceland, Norway and Sweden^[4]
• Great Britain and Ireland^[5]