Sphaerium nucleus
{{Short description|Species of bivalve}}
{{Speciesbox
| image =
| status = LC
| status_system = IUCN3.1
| genus = Sphaerium
| species = nucleus
| authority = (Studer, 1820)Studer, S. 1820. Kurzes Verzeichniss der bis jetzt in unserm Vaterlande entdeckten Conchylien. - Naturwissenschaftlicher Anzeiger der Allgemeinen Schweizerischen Gesellschaft für die Gesammten Naturwissenschaften 3 (11): 83-90, 91-94. Bern.
| synonyms =
- Sphaerium corneum var. nucleus
- Cyclas nucleus Studer, 1820
}}
Sphaerium nucleus is a freshwater bivalve of the family Sphaeriidae. It has been often confused with Sphaerium corneum and is consequently quite poorly known.
Description
Sphaerium nucleus is a very small bivalve which may grow up to 8mm in width and length. It differs from Sphaerium corneum only in details. Like almost all bivalves, it is a filter-feeder.
Taxonomy
Sphaerium nucleus was described by Studer 1820, who placed it in the genus Cyclas. It was later thought to be a subspecies of Sphaerium corneum. Subsequently it was raised to a full species again as Sphaerium nucleus (Studer, 1820) due to its having a different form of kidney, and the shell having a broad hinge plate, dense porosity and more tumid shells with broad umbones. Unlike S. corneum it has a preference for temporary habitats.Korniushin, A.V. 2001: Taxonomic revision of the genus Sphaerium s. l. in the Palaearctic region, with some notes on the North American species. Arch. Molluskenk. 129: 77–122.
Distribution
S. nucleus occurs widely in Europe, from Spain to Ukraine. It appears to be absent from Russia.
- Austriahttp://ipp.boku.ac.at/private/wf/Check_List_of_Austrian_Mollusca.html etzte Änderung am 24.10.2005. Cited March 24, 2007
- Britain and IrelandAnderson, R. 2005, An Annotated List of the Non-Marine Mollusca of Britain and Ireland, Journal of Conchology, London, 38: 607-638.Killeen, I.J., Aldridge, D.C. & Oliver, P.G.,
2004. Freshwater bivalves of Britain and Ireland. Field Studies Occasional Publication 82. FSC Publications,
Shrewsbury. 114pp. (but see)
- Czech Republic – in Bohemia, in Moravia{{in lang|cs}} 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. [http://mollusca.sav.sk/pdf/9/Suppl-1.pdf PDF].Kořínková T., 2006: The first reliable records of Sphaerium nucleus (Mollusca: Bivalvia: Sphaeriidae) in the Czech Republic. Acta Soc. Zool. Bohem. 69: 293-297. ISSN 1211-376X [http://web.natur.cuni.cz/zoologie/invertebrata/Korinkova_2006_First%20reliable%20records%20of%20Sphaerium%20nucleus.pdf pdf]
- GermanyGlöer P. & Meier-Brook C., 2003: Süsswassermollusken. DJN, pp. 134, page 109, {{ISBN|3-923376-02-2}}
- Kyrgyzstan[http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/species?id=2747 AnimalBase :: Sphaerium nucleus species homepage] (but see)
- SlovakiaKošel V., 2006: The first record of Sphaerium nucleus (Bivalvia) in Slovakia. Biologia. Vol. 61, No. 5, page 524
- UkrainePripyat Marshes of Ukraine, RGS 1998 Ralph Brown Expedition: report by Dr O.V. Korniushin http://www.minter.demon.co.uk/brown/results/korniush.htm
Ecology
References
{{Reflist}}
External links
- [http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/species?id=2747 Sphaerium nucleus] at Animalbase taxonomy,short description, distribution, biology,status (threats), images
- [http://eol.org/pages/7012485/media Sphaerium nucleus ] images at Encyclopedia of Life
{{Taxonbar|from=Q3013911}}
Category:Bivalves described in 1820
Category:Taxobox binomials not recognized by IUCN
{{Sphaeriidae-stub}}