| 词条 | Pisidium amnicum |
| 释义 |
| name = Pisidium amnicum | image = Pisidium amnicum.jpg | image_caption = | status = NE | status_ref = [1] | regnum = Animalia | phylum = Mollusca | classis = Bivalvia | subclassis = Heterodonta | ordo = Veneroida | subordo = Sphaeriacea | superfamilia = | familia = Sphaeriidae | subfamilia = | genus = Pisidium | subgenus = | species = P. amnicum | binomial = Pisidium amnicum | binomial_authority = (O. F. Müller, 1774) | range_map = | range_map_width = 250px | synonyms = }} Pisidium amnicum is a species of very small freshwater clam, sometimes known as the greater European peaclam or the River pea shell. It is an aquatic bivalve in the family Sphaeriidae. DescriptionAlthough only 9 mm (range 7–11 mm.) in length, this species is considerably larger than most Pisidium species, and has a fairly thick, concentrically ridged shell. Its shell is solid, glossy, triangular-oval in shape, and has broad but not prominent umbos often coated with a dull ferruginous deposit. Its colour is grey-white to brown, often with a greenish cast. DistributionIts native distribution is Palearctic. The species has been introduced to northeastern North America.
EcologyIn Europe, it requires clean water and high levels of calcium. References1. ^2006 IUCN Red List of Threatened Species. 2. ^Red List of the molluscs (Mollusca) of the Czech Republic http://mollusca.sav.sk/malacology/redlist.htm 3. ^1 {{cs icon}} 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. 4. ^Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, {{ISBN|3-923376-02-2}} 5. ^{{Citation| last = Kuiper| first = J. G. J. |author2=Økland, K. A. |author3=Knudsen, J. |author4=Koli, L. |author5=von Proschwitz, T. |author6=Valovirta, I.| title = Geographical distribution of the small mussels (Sphaeriidae) in North Europe (Denmark, Faroes, Finland, Iceland, Norway and Sweden)| journal = Annales Zoologici Fennici| volume = 26| issue = 2| year = 1989| pages = 73–101| url =http://www.sekj.org/PDF/anzf26/anz26-073-101.pdf}} 6. ^Roy Anderson, 2005 An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637, (published 2005) . External links
3 : Pisidium|Palearctic molluscs|Molluscs described in 1774 |
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