Pisidium henslowanum

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Pisidium henslowanum
Pisidium Henslowianum (Sowerby).jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
Order: Sphaeriida
Family: Sphaeriidae
Genus: Pisidium
Species:
P. henslowanum
Binomial name
Pisidium henslowanum
(Sheppard, 1823)

Pisidium henslowanum is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae. It is commonly referred to as the Henslow peaclam.

Contents

Etymology

The specific name honours John Stevens Henslow.

Description

The shell is obliquely oval. It has prominent, narrow umbos well behind the middle and the umbos have oblique raised crests. The surface (periostracum) is silky with fine, even concentric striae. The colour is greyish, especially at the umbos. Widespread but local and uncommon. The size is 3.5-5mm.

Distribution

Its native distribution is Holarctic.

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References

  1. 1 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.
  2. ↑ Beran, L. (2002) Vodní měkkýši České Republiky - rozšíření a jeho změny, stanoviště, šíření, ohrožení a ochrana, červený seznam. Aquatic molluscs of the Czech Republic - distribution and its changes, habitats, dispersal, threat and protection, Red List. - Sborník přírodovědného klubu v Uherském Hradišti, Supplementum 10, 258 pp.
  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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