
Appearance
Like all species in this family, this snail has a clausilium. This spoon-shaped "door" is supported by, and slides in, a series of internal shell folds, see the image below.The weight of the adult live snail is 148.6±5.7 mg.
Distribution
This species is known to occur in a number of European countries and islands including:⤷ Czech Republic
⤷ Poland
⤷ Slovakia
⤷ Bulgaria
⤷ Greece
⤷ Switzerland
⤷ France
⤷ Belgium
⤷ Netherlands
⤷ Great Britain
This species is rare in Great Britain. In England, it is found mainly in the London area, almost exclusively along the River Thames, and is particularly preserved at Isleworth Ait. There is also a colony at Purfleet in Essex.
⤷ and other areas
References:
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