Pisidium conventus, the arctic-alpine pea clam, is a species of freshwater bivalve from the family Sphaeriidae.
| Pisidium conventus | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Sphaeriida |
| Family: | Sphaeriidae |
| Genus: | Pisidium |
| Species: | P. conventus
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| Binomial name | |
| Pisidium conventus Clessin, 1877
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Description
editThe small (2.2–2.8 mm.) shell is oval in shape and thin and fragile. It is broad and flattened (laterally compressed) with flattened umbos near the midpoint. The colour is yellowish-white and the periostracum (surface) is silky with fine, concentric striation.
Ecology
editP. conventus is a relict of colder climatic periods found only in deep, cold, upland lakes.
Distribution and conservation status
edit- Not listed in IUCN red list – not evaluated (NE)[1]
- Germany – endangered (gefährdet)[2]
- Poland – vulnerable (VU)[3]
- Nordic countries: Faroes, Finland, Norway and Sweden (not in Denmark, Iceland)[4]
- Great Britain and Ireland[5]
References
edit- ^ 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Cited 30 May 2007.
- ^ Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
- ^ Pisidium conventus - Polish Red Data Book of Animals
- ^ 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
- ^ Roy Anderson ,2005 An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637, (published 2005) [1].
External links
edit- Pisidium conventus at Animalbase taxonomy,short description, biology,status (threats)
- Polish Red Data Book
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