Anisus
| Anisus | ||||||||||||
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Dainty poppy snail |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Anisus | ||||||||||||
| Studer , 1820 |
Anisus is a genus of the family of poppy snails (Planorbidae) from the suborder of the water pulmonate snails (Basommatophora). These are small forms with an almost planispirally rolled up casing.
features
The housings of the Anisus species are small (up to about 10 mm in width, up to 2 mm in height) and flat-disk-shaped, only the belly side is slightly deeper than the back side. The mouth is mostly more or less oblique to the axis of the winding, the windings only encompass each other moderately to slightly. They also gain moderately, and about 4 to 8 whorls are formed. Some species develop more or less clear edges on their first or last walks.
Way of life, occurrence and distribution
The animals live in swamps, ponds and also in temporarily drying waters. They live on plant matter and possibly also on detritus. The species of the genus are distributed in the Palearctic.
Systematics
The genus is divided by many authors into two sub-genera Anisus (Anisus) and Anisus (Disculifer) C. Boettger, 1944. The species found in Europe are:
- Tightly coiled poppet snail ( Anisus (Anisus) calculiformis (Sandberger, 1875))
- White-mouthed cochlea ( Anisus (Anisus) leucostoma (Millet, 1813))
- Lipped cuttlefish ( Anisus (Anisus) spirorbis (Linnaeus, 1758))
- Anisus (Anisus) strauchianus (Clessin, 1886)
- Sharp cupped snail ( Anisus (Disculifer) vortex (Linnaeus, 1758))
- Anisus vorticulus ( anisus (Disculifer) vorticulus (Troschel, 1834))
literature
- Rosina Fechter and Gerhard Falkner: molluscs. 287 pp., Munich, Mosaik-Verlag 1990 (Steinbach's Nature Guide 10) ISBN 3-570-03414-3
- Ewald Frömming: Biology of the Central European freshwater snails. 313 pp., Duncker & Humblot, Berlin 1956.
- Peter Glöer: The animal world of Germany. Mollusca I Freshwater gastropods of Northern and Central Europe Key to identification, way of life, distribution. 2. rework. Ed., 327 pages, ConchBooks, Hackenheim 2002, ISBN 3-925919-60-0
