Description: A fairly tumid, rounded, trapezoidal shell with fairly narrow umbos slightly behind the mid point. Surface fairly glossy, with coarse, irregular concentric striae. Colour grey to brownish white. Widespread in the west. 3-4.5mm.

World Distribution: A northern and alpine species. Distribution type: Circumpolar Boreal-montane (46).

Irish Distribution: Largely restricted to western and northern parts and much rarer in lowland habitats than related species. Appears to be declining.

Ecology:

• The principal habitats of this species are deep, clear lakes in mountain districts
• It lives in sands or gravels on the margins
• May also occur locally at low altitudes where larger habitats are available in the west and north.

Key Identification Features:

• A moderately tumid shell with a less equilateral shape than P. hibernicum
• Trapezoidal with umbos slightly behind the mid point
• Surface glossy with coarse, irregular concentric striae
• Colour grey to brownish white

Red list status:

• Vulnerable (VU).

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

iNaturalist: Euglesa lilljeborgii at iNaturalist World Species Observations database.

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

Thumbnails for genus Euglesa