Description: A tumid, roughly rectangular shell with broad, swollen umbos lying behind the mid point. Surface very glossy, with fairly strong, irregular, concentric striae. Colour yellow to pale brown. Rectangular shape characteristic. Widespread. 2.5-3.5mm.

World Distribution: Distribution type: Circumpolar Wide-temperate (66).

Irish Distribution: Widespread but becoming slightly rarer towards the north coast and commonest on the central plain.

Ecology:

• Widespread in slow-moving water of rivers, streams and drains
• Found in some lake margins
• Although not excluded from more acid waters, generally rare in the highlands

Key Identification Features:

• A tumid, roughly rectangular shell
• Umbos broad and swollen and lying behind the mid point
• Surface glossy with fairly strong, irregular, concentric striae
• Colour yellow to pale brown

Red list status:

• Least concern (lc).

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

iNaturalist: Euglesa milium at iNaturalist World Species Observations database.

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

Thumbnails for genus Euglesa