Alinda biplicata explained

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. ^{[1] [2]}

Distribution

This species is known to occur in a number of 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.^[3] There is also a colony at Purfleet in Essex.^[4]

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.^[5]

External links

• Balea biplicata at AnimalBase
• Balea biplicata at BioLib with images and synonyms
• images
• Photo of a mating pair: http://petsnails.proboards.com/index.cgi?action=display&board=snailpictures&thread=6495
• 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

Notes and References

1. 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.
2. https://web.archive.org/web/20121012141111/http://www.faunaeur.org/full_results.php?id=422503 fauna-eu.org
3. http://news.bbc.co.uk/2/hi/uk_news/england/london/6385521.stm Rare snail habitat is protected
4. Web site: Island Sanctuary For Sweaty, Hairy Snails Becomes London's Latest Local Nature Reserve . Thames Water . 22 February 2007 . dead . https://web.archive.org/web/20080324132149/http://www.thameswater.co.uk/UK/region/en_gb/content/News/News_001322.jsp?SECT=Section_Homepage_000431 . 24 March 2008 .
5. Boch . Steffen . Prati . Daniel . Werth . Silke . Rüetschi . Jörg . Fischer . Markus . Lichen endozoochory by snails . PLOS ONE . 2011 . 6 . 4 . e18770 . 10.1371/journal.pone.0018770. free . 21533256 . 3076439 . 2011PLoSO...618770B .