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. 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.fauna-eu.org "Alinda (Alinda) biplicata (Montagu 1803)". Fauna Europaea, last update 27 January 2011, accessed 17 April 2011.
Distribution This species is known to occur in several European countries and islands, including:
Czech Republic Poland Slovakia Hungary Romania Bulgaria Greece Slovenia Croatia Serbia Switzerland Austria Germany France Belgium Netherlands Denmark Sweden 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.Rare snail habitat is protected. BBC News, last updated: Thursday, 22 February 2007, 11:16 GMT. There is also a colony at Purfleet in Essex.
Description 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.
References
External links
Balea biplicata at AnimalBase Balea biplicata at BioLib with images and synonyms images 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