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Pisidium pseudosphaerium
	Photo of external view of the left valve of Pisidium pseudosphaerium
	Photo of external umbilical view of both valves of Pisidium pseudosphaerium. (Left valve is on the lef, right valve is on the right.)
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Pisidium
Species:	P. pseudosphaerium
Binomial name
	Pisidium pseudosphaerium; Favre, 1927

Pisidium pseudosphaerium is a species of freshwater bivalve from family Sphaeriidae.

Description

The 2.5-3.2mm shell is a flattened, regular, slightly angulated oval shape with low central umbos. The surface is silky with very fine concentric striations. In colour it is straw-yellow with scattered red-brown deposits.

Distribution

Its native distribution is central European and western European.

Czech Republic - in Bohemia, in Moravia,^[2] critically endangered (CR)^[3]
Germany - critically endangered (vom Aussterben bedroht) ^[4]
Nordic countries: Denmark, Finland (near threatened^[5]), Norway and Sweden (not recorded in Faroes, Iceland)^[6]
Great Britain and Ireland^[7]

References

^ Killeen, I. (2011). "Pisidium pseudosphaerium". IUCN Red List of Threatened Species. 2011: e.T155821A4849042. doi:10.2305/IUCN.UK.2011-2.RLTS.T155821A4849042.en. Retrieved 19 November 2021.
^ (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.
^ Red List of the molluscs (Mollusca) of the Czech Republic http://mollusca.sav.sk/malacology/redlist.htm
^ Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
^ "Threatened and Near Threatened molluscs". www.environment.fi. Finnish Environment Institute. 2001. Archived from the original on 11 May 2013. Retrieved 11 April 2012.
^ 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

Pisidium pseudosphaerium at Animalbase taxonomy,short description, biology,status (threats), images

This Sphaeriidae-related article is a stub. You can help Wikipedia by expanding it.

[iucn_status_19_November_2021-1] Killeen, I. (2011). "Pisidium pseudosphaerium". IUCN Red List of Threatened Species. 2011: e.T155821A4849042. doi:10.2305/IUCN.UK.2011-2.RLTS.T155821A4849042.en. Retrieved 19 November 2021.

[Horsák_2010-2] (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.

[3] Red List of the molluscs (Mollusca) of the Czech Republic http://mollusca.sav.sk/malacology/redlist.htm

[4] Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2

[5] "Threatened and Near Threatened molluscs". www.environment.fi. Finnish Environment Institute. 2001. Archived from the original on 11 May 2013. Retrieved 11 April 2012.

[kuiper1989-6] 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

[7] 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].

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