Four-toothed diaper snail
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Four-toothed diaper snail ( Vertigo geyeri ) |
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| Vertigo geyeri | ||||||||||||
| Lindholm , 1925 |
The four-toothed diaper snail ( Vertigo geyeri ) is a type of snail from the family of the diaper snail (Vertiginidae), which belongs to the subordination of the land snail (Stylommatophora). It is a very small shape that only grows 2mm.
features
The bulbous, egg-shaped housing measures 1.7 to 1.9 mm in length and 1.2 mm in width. There are up to 5 turns, which are separated from each other by deep seams. The mouth has a max. 4 small protrusions (so-called "teeth") (one parietal, one columellar and two palatal), but there can also be fewer teeth. The color of the case is red-brown and the surface is glossy. The cases are almost smooth apart from a weak, regular streak of growth.
Similar species
The shell resembles the bare diaper snail ( Vertigo genesii ). Its housing is a little less conical and the mouth is toothless.
Geographical distribution and habitat
The species is especially widespread in Scandinavia up to 64 ° latitude. There is a larger isolated occurrence in Ireland. Very small occurrences are known in England, Scotland and Wales. In the south, the distribution area extends, mostly in small occurrences, as far as northern Germany, southern Germany, the Czech Republic, Slovakia and the alpine regions of Austria and Switzerland, eastern France (Franche-Comte, Haute-Savoie) in the east as far as northwestern Russia. The species is interpreted as a glacial relic species. Recently the species was also found in the Central Altai.
The animals live on the edge of chalk-rich moors and swamps. They prefer pH values between 7 and 8 and water levels that are as constant as possible. The banks should be covered with rushes ( Juncus ) and sedges ( Carex ). Little is known about lifestyle and diet.
Taxonomy
The taxon was first described in 1925 by Wilhelm Adolf Lindholm (also Wassili Adolfowitsch Lindholm) as the subspecies Vertigo genesii geyeri . Some authors subdivide the genus Vertigo into two sub-genera Vertigo (Vertigo) OF Müller, 1773 and Vertigo (Vertilla) Moquin-Tandon, 1856. In this sub-genus, the four- toothed diaper snail is placed in the genus Vertigo (Vertilla) .
Danger
The four-toothed diaper snail is endangered in Germany due to the destruction of its habitat. It is therefore on the "Red List" and is classified as threatened with extinction (hazard category 1). Overall, however, the IUCN classifies the species as not endangered. The population trend is stable.
supporting documents
literature
- Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg & Berlin 1983, ISBN 3-490-17918-8
- Uwe Jueg & Holger Menzel-Harloff: Vertigo geyeri LINDHOLM 1925 in Mecklenburg-Western Pomerania (subfossil and recent) (Gastropoda: Stylommatophora: Vertiginidae). Malakologische Abhandlungen Staatliches Museum für Tierkunde Dresden, 18 (11): 8 S., Dresden 1996 PDF
- Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. A1-A3 p., 679 p., Q1-Q78 p., Göttingen, Planet Poster Ed., 2012 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5 (p. 126)
Individual evidence
- ↑ Benoît Lecaplain: Un nouveau mollusque de la Directive Habitats-Faune-Flore pour la France: découverte du Vertigo septentrional Vertigo geyeri Lindholm, 1925 (Gastropoda, Vertiginidae) en Franche-Comté et en Haute-Savoie. MalaCo, 9: 453–456, 2013 PDF ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. .
- ↑ Stefan Meng: New data on the distribution of the Vertiginidae (Gastropoda: Pulmonata) in Central Asia. Mollusca, 26 (2): 207-219, Dresden 2008 PDF
- ↑ Wassili Adolfowitsch Lindholm: Studies on palaearctic Vertigo species. Archives for Molluscology, 57 (5/6): 241–251, Frankfurt / M. 1925
- ^ Molluscs of Central Europe
- ↑ JH Jungbluth, D. von Knorre (with the assistance of U. von Bössneck, K. Groh, E. Hackenberg, H. Kobialka, G. Körnig, H. Menzel-Harloff, H.-J. Niederhöfer, S. Petrick, K Schniebs, V. Wiese, W. Wimmer, ML Zettler): Red list of internal mollusks [snails (Gastropoda) and mussels (Bivalvia)] in Germany. Announcements of the German Malacoological Society, 81: 1–28, Frankfurt / M. 2009 PDF ( Memento of the original from June 16, 2013 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (1.3 MB)
- ↑ Vertigo geyeri in the IUCN Red List of Threatened Species 2013.1. Posted by: Killeen, I., Moorkens, E. & Seddon, MB, 2011. Retrieved September 14, 2013.
