Slim diaper snail
| Slim diaper snail | ||||||||||||
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Slender diaper snail ( Vertigo heldi ) |
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| Scientific name | ||||||||||||
| Vertigo heldi | ||||||||||||
| ( Clessin , 1877) |
The slender diaper snail ( Vertigo heldi ) is a species of snail from the family of the diaper snail (Vertiginidae) in the suborder of the land snail (Stylommatophora).
features
The right-hand wound, cylindrical housing of the slim diaper snail is 2.5 to 2.7 mm high and 1.2 mm wide (according to Clessin 4.0 to 4.5 mm high, 1 mm wide). It has 5.5 to 6 arched turns, which are separated from each other by a deep seam. The last three turns hardly increase in diameter. The end turn forms an edge or "shoulder" under the seam. The case is brown and translucent with a glossy finish; this is very finely striped. The mouth edge is hardly thickened and therefore appears relatively sharp. Only a weak neck bulge is formed on the upper edge. The teeth, a palatal and a parietal, are only weakly developed, and in some cases are even absent. The inside of the callus is only weakly pronounced.
Similar species
The species is difficult to distinguish from some extreme forms of the very variable common diaper snail ( Vertigo pygmaea ). As a rule, however, the shell of the slender diaper snail is larger, somewhat more cylindrical and therefore narrower than the shell of the common diaper snail. Fresh housings are more translucent and the surface is more shiny.
Geographical distribution and habitat
The distribution area of the species is restricted to southern Germany, northern Switzerland and Austria. In Switzerland it occurs at 300 to 400 m above sea level. It is very rare and the occurrences are very dispersed. It lives there on swampy meadows and damp grassland, mainly in the hill country.
Taxonomy
The taxon was first described in 1877 by Stephan Clessin as Pupa (Vertigo) Heldi . 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 slender diaper snail is placed in the genus Vertigo (Vertigo) .
Danger
In Germany, the species is threatened with extinction (hazard category 1).
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 (p. 92)
- 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)
- AnimalBase. Species summary for Vertigo heldi
Individual evidence
- ↑ a b Stephan Clessin: A new pupa. Bulletin of the German Malacoological Society, 9 (4-5): pp. 49–51. Frankfurt am Main, 1877 Online at www.biodiversitylibrary.org (p. 49ff.).
- ^ Molluscs of central Europe Vertigo heldi
- ↑ 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 Malacozoological Society, 81: pp. 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)
Web links
- Fauna Europea: Vertigo heldi
- Vertigo heldi inthe IUCN 2013 Red List of Endangered Species . Posted by: Neubert, E., 2011. Retrieved February 13, 2014.