Description: Shell a flattened, regular, slightly angulated oval with low central umbos. Surface silky with very fine concentric striations. Colour straw coloured with scattered red-brown deposits. Rare and very local. 2.5-3.2mm.

World Distribution: Confined to Europe. Distribution type: European Temperate (73).

Irish Distribution: Added to the Irish list by Kerney (1969) from three sites along the Royal Canal in Kildare and Westmeath, and from the Lagan Canal near Moira, Antrim. It has not been seen recently in the Lagan canal but is still found in the Royal Canal.

Ecology:

• On the Continent it is said to be restricted to stagnant water of swamps and ditches, but in any event, mainly in unstable environments
• In Britain it occupies grazing marshes in eastern and southern England
• It has been found only in canals in Ireland but may have been introduced

Key Identification Features:

• Shell a flattened nearly regular oval
• Umbos low and central
• Surface silky with very fine concentric striations
• Shell straw coloured with scattered red-brown deposits

Red list status:

• Endangered (EN).

Distribution Map from NBN: Euglesa pseudosphaerium at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Euglesa pseudosphaerium at iNaturalist World Species Observations database.

GBIF data for Euglesa pseudosphaerium | Classification: Bivalvia, Sphaeriida, Sphaeriidae, Euglesa

Thumbnails for genus Euglesa