MolluscIreland - land and freshwater
  • Pisidium pulchellum Jenyns 1832 Iridescent pea mussel

Map hosted by the National Biodiversity Data Centre, Waterford
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A tumid, obliquely oval shell with broad umbos well behind the mid point. Surface glossy with regular concentric ribbing. Colour grey to cream tinged pink/orange from the animal inside. Widespread but declining.

Key characteristics

  • A medium-sized tumid, obliquely oval, shell
  • Umbos broad and sitting well behind the mid point
  • Surface glossy with regular concentric ribbing
  • Colour grey to cream tinged pink/orange from the animal inside

Size

3.5-4mm.

World Distribution

Distribution type: Eurasian Temperate (75).

Irish Distribution

Always an uncommon species preferring very clean water. Scattered in the east and centre but probably in decline due to eutrophication (enrichment) of many water-bodies.

Ecology

  • Confined to richer (calcareous, low trophic) drains and streams
  • Also in small, clean lakes and ponds

Red List status

  • Endangered (EN).

Wikipedia link

Wikipedia page for Pisidium pulchellum

 Anderson, R., (2016). Pisidium pulchellum Jenyns 1832. [In] MolluscIreland.
http://www.habitas.org.uk/molluscireland/species.asp?ID=137 Accessed on 2017-12-13.