Spotted snail
| Spotted snail | ||||||||||||
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Spotted snail ( Arianta arbustorum ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Arianta arbustorum | ||||||||||||
| ( Linnaeus , 1758) |
The spotted snail ( Arianta arbustorum ), also called tree snail or tree snail , is a shell- bearing land snail . Their distribution area extends from northwest Europe to central Europe.
features
The housing of Arianta arbustorum is spherical with a conical raised thread. However, the height of the thread and the size of the navel are very variable. The umbilicus is usually (but not always) completely covered by the spindle envelope of the white mouth lip. There are essentially two different shapes: a shape with a spherical housing and a closed navel, and a shape with a flattened thread and an open navel. The latter form is limited to a few high-lying areas in the Alps. Their coloring is usually maroon with yellow spots and a dark band. Arianta arbustorum is one of the most variable species of snail in terms of shape . In many cases, different geographic valley and mountain forms are described, which is due to their pronounced polymorphism . Similar to the banded snails, Arianta arbustorum 's selection by throttles ( throttle forge ) led to a distribution of different looking shells.
Occurrence
Due to its low ecological demands, it can be found in many locations, including a. in mountains (up to 2700 m), in forests and open biotopes. However, it prefers moist habitats . The high mountain shape with a flattened case and open navel is interpreted as a relic shape that survived on Nunatakkern during the last Ice Age .
literature
- Rosina Fechter and Gerhard Falkner: molluscs. 287 pp., Munich, Mosaik-Verlag 1990 (Steinbach's Nature Guide 10) ISBN 3-570-03414-3
- Helmut Sattmann and Hans Leo Nemeschkal: Genital morphometric studies on Arianta arbustorum (LINNÉ 1758), A. chamaeleon (L. PFEIFFER 1842) and A. schmidti (ROSSMÄSSLER 1836) (Mollusca, Gastropoda, Helicidae). Annalen des Naturhistorisches Museum Wien, 94/95 B, pp. 353–359, 1993 online version (PDF; 1.2 MB)
Web links
- Animal base
- Arianta arbustorum inthe IUCN 2013 Red List of Threatened Species . Posted by: Falkner, G., Falkner, M., von Proschwitz, T. & Neubert, E, 2011. Retrieved February 13, 2014.
Individual evidence
- ^ E. Gittenberger, WH Piel and DSJ Groenenberg: The Pleistocene glaciations and the evolutionary history of the polytypic snail species Arianta arbustorum (Gastropoda, Pulmonata, Helicidae). Molecular Phylogenetics and Evolution, 30: 64-73, San Diego, Cal. 2004 doi: 10.1016 / S1055-7903 (03) 00182-9