Alinda biplicata,[3][4] also known as Balea biplicata, common name the two lipped door snailorThames door snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails, all of which have a clausilium.
| Alinda biplicata | |
|---|---|
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| Shell of Alinda biplicata | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Order: | Stylommatophora |
| Family: | Clausiliidae |
| Genus: | Alinda |
| Species: |
A. biplicata
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| Binomial name | |
| Alinda biplicata | |
| Synonyms | |
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This species is known to occur in a number of European countries and islands including:
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.[5] There is also a colony at PurfleetinEssex.[6]
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 149±6 mg.[7]
