Eccentric Grass Snail - Vallonia excentrica

Description

A very small snail (2mm) with a pale white or cream shell. It is flattened with a large umbilicus and a prominent lip around the mouth. The last whorl flares giving the shell and the umbilicus an eccentric appearance.

Similar Species

Hard to distinguish from Vallonia pulchella (the two species were only recognised as separate species recently). V. excentrica has a more flared last whorl so is not as rounded as V. pulchella. This flaring causes the umbilicus to be eccentric (ie. not a regular spiral). Also the lip gently flares from the shell in V. excentrica whilst in V. pulchella it creates a sharp angle with the shell.

Identification difficulty
ID guidance
  • c2mm with pale shell
  • thickened lip that flares gently from the shell (but not at a sharp angle)
  • deep and eccentric umbilicus
Habitat

Dry, calcareous grassland, dunes and occasionally walls.

When to see it

All year.

UK Status

Relatively common and widespread.

VC55 Status

Rare or under-recorded.

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Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map