Alinda biplicata

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Alinda biplicata
Alinda biplicata 2.jpg
A drawing of a shell of Alinda biplicata
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia

clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra

Superfamily: Clausilioidea
Family: Clausiliidae
Subfamily: Baleinae
Genus: Alinda
Species: A. biplicata
Binomial name
Alinda biplicata
(Montagu, 1803)[2]
  • Turbo biplicata Montagu, 1803
  • Balea biplicata (Montagu, 1803)
  • Laciniaria biplicata

Alinda biplicata,[3][4] also known as Balea biplicata, common name the two lipped door snail or Thames 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.


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 Purfleet in Essex.[6]

The internal shell anatomy of the body whorl of Alinda biplicata
1 - Lamella superior
2 - Lamella inferior
3 - Lamella subcolumellaris
4 - Lunella
5 - Clausilium
6 - Plica medialis
7 - Plica principalis
8 - Lamella spiralis


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.[7]


  1. ^ 2006 IUCN Red List of Threatened Species. <>. cited October 16, 2007.
  2. ^ Montagu, G. (1803). Testacea Britannica, or natural history of British shells. pp. I-XXXVIII [= 1-38], 1-606, [1-4], pl. 1-16. London.
  3. ^ Kantor Yu I., Vinarski M. V., Schileyko A. A. & Sysoev A. V. (published online on March 2, 2010). "Catalogue of the continental mollusks of Russia and adjacent territories". Version 2.3.1.
  4. ^ [ "Alinda (Alinda) biplicata (Montagu 1803)". Fauna Europaea, last update 27 January 2011, accessed 17 April 2011.
  5. ^ Rare snail habitat is protected. BBC News, last updated: Thursday, 22 February 2007, 11:16 GMT.
  6. ^ Water Island Sanctuary For Sweaty, Hairy Snails Becomes London's Latest Local Nature Reserve 22 Feb 07
  7. ^ Boch S., Prati D., Werth S., Rüetschi J. & Fischer M. (2011). "Lichen Endozoochory by Snails". PLoS ONE 6(4): e18770. doi:10.1371/journal.pone.0018770.

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