Description: Shell a flattened, glossy coil of 3½ whorls with well-marked radial striae. Whorls flattened above with shallow sutures. Umbilicus moderately wide. Shell translucent pale brown, colourless or greenish. Animal dark. Common. 3.5-4.2 mm.

World Distribution: Described in older works as Circumpolar but the form in North America (Nesovitrea electrina (Gould)) is now regarded as specifically distinct (Pilsbry, 1948). Range therefore Eurasian Wide-temperate (65).

Irish Distribution: Ubiquitous in woods and wet places.

Ecology:

• Common in wet places in woods
• Also in unimproved pasture, heaths and marshes
• Tolerant of soil acidity and one of the few shelled molluscs found on blanket peat and at altitude

Key Identification Features:

• A small, glossy, flattened shell with well-marked radial striae
• Colour variable - translucent brown, colourless or greenish
• Whorls flattened above with a shallow suture
• Animal dark in colour

Red list status:

• Least concern (lc).

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

iNaturalist: Nesovitrea hammonis at iNaturalist World Species Observations database.

GBIF data for Perpolita hammonis | Classification: Gastropoda, Stylommatophora, Gastrodontidae, Perpolita

Thumbnails for genus Perpolita