Thermen dwarf spring snail
| Thermen dwarf spring snail | ||||||||||||
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_-_Hydrobiidae_-_Mollusc_shell.jpeg)
Glass tube with casing from Bythinella parreyssii , Naturalis , Leiden |
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| Scientific name | ||||||||||||
| Belgrandiella parreyssii | ||||||||||||
| ( L. Pfeiffer , 1841) |
The spa dwarf spring snail ( Belgrandiella parreyssii , syn .: Bythinella parreyssii , Paludina parreyssii ) is a very small species of dwarf spring snail in the family of the water lamb snail (Hydrobiidae), endemic in Lower Austria .
features
The right-hand twisted, squat egg-shaped, transparent casing of the thermal bath dwarf spring snail reaches a length of 1.3 mm and a width of 0.9 mm with around three and three-quarters of a circle. The housing mouth is thickened towards the wall and has an enlarged mouth seam at the base. The navel is closed. The operculum is red-brown to cherry-red in color. The snail, very lively in its movements, is black, gray or white with a narrow, short trunk, a short foot and long, hair-shaped antennae.
Distribution and way of life
The thermal spring snail is stenothermic and lives exclusively in warm spring water under stones. It has these conditions in the approximately 23.5 ° C warm thermal spring of Bad Vöslau and the Hansybach in Lower Austria , which is fed by it , its only known occurrence. Since the 1970s, the populations have decreased significantly, which is why the species is classified as a critically endangered species by IUCN .
literature
- Louis Pfeiffer : Contributions to the mollusc fauna of Germany, especially the Austrian states . In: WF Erichson (Ed.): Archive for Natural History, Seventh Volume, First Volume, Nicolai'sche Buchhandlung, Berlin 1841, pp. 205–275, here pp. 227f .: Paludina, 1. P. Parreyssii .
- Peter Glöer: The animal world of Germany. Mollusca I. Freshwater gastropods of Northern and Central Europe - identification key, way of life, distribution. 2. rework. Ed., 327 p., ConchBooks, Hackenheim 2002. p. 109. Belgrandiella parreyssii (L. Pfeiffer 1841) = Paludina parreyssii ... Pfeiffer (1841) . ISBN 3-925919-60-0
Web links
- M. Haase, P. Reischutz (2010): Belgrandiella parreyssii (Pfeiffer, 1828) . The IUCN Red List of Threatened Species 2010: e.T2728A9472571. doi : 10.2305 / IUCN.UK.2010-4.RLTS.T2728A9472571.en .