|Shell of Alinda biplicata|
Alinda biplicata, 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. There is also a colony at Purfleet in Essex.
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.
- Kappes, H. (2017). "Alinda biplicata". IUCN Red List of Threatened Species. 2017. Retrieved 1 May 2018.old-form url
- Montagu, G. (1803). Testacea Britannica, or natural history of British shells. pp. I-XXXVIII [= 1-38], 1-606, [1-4], pl. 1-16. London.
- 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". http://www.ruthenica.com/documents/Continental_Russian_molluscs_ver2-3-1.pdf Version 2.3.1.
- http://www.faunaeur.org/full_results.php?id=422503 "Alinda (Alinda) biplicata (Montagu 1803)". Fauna Europaea, last update 27 January 2011, accessed 17 April 2011.
- Rare snail habitat is protected. BBC News, last updated: Thursday, 22 February 2007, 11:16 GMT.
- Water Island Sanctuary For Sweaty, Hairy Snails Becomes London's Latest Local Nature Reserve 22 Feb 07[permanent dead link]
- 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.
|Wikimedia Commons has media related to Alinda biplicata.|
- Balea biplicata at AnimalBase
- Balea biplicata at BioLib with images and synonyms
- Photo of a mating pair: 
- Sulikowska-Drozd A., Maltz T. K. & Kappes H. (2013). "Brooding in a temperate zone land snail: seasonal and regional patterns". Contributions to Zoology 82(2): http://www.ctoz.nl/vol82/nr02/a02