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
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
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.

References
  1. (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
  2. Red List of the molluscs (Mollusca) of the Czech Republic http://mollusca.sav.sk/malacology/redlist.htm
  3. Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
  4. Kuiper, J. G. J.; Økland, K. A.; Knudsen, J.; Koli, L.; von Proschwitz, T.; Valovirta, I. (1989), "Geographical distribution of the small mussels (Sphaeriidae) in North Europe (Denmark, Faroes, Finland, Iceland, Norway and Sweden)" (PDF), Annales Zoologici Fennici, 26 (2): 73–101
  5. Roy Anderson ,2005 An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637, (published 2005) .
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