Planorbis
Planorbis | ||||||||||
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Common poppet snail ( Planorbis planorbis ) |
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Systematics | ||||||||||
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Scientific name | ||||||||||
Planorbis | ||||||||||
OV Müller , 1773 |
Planorbis is a genus of snails from the family of flat-faced snails (Planorbidae), which belongs to the (probably paraphyletic) subordination of water pulmonary snails (Basommatophora) within the lung snails (Pulmonata).
features
The case is almost planispiral, only slightly sunk on the underside. A distinct keel is formed on the outside. However, the animals are anatomically twisted to the left. If the housing is oriented accordingly, horizontally with the opening to the left of the center, the spiral is recessed at the top. The animals carry the housing tilted sideways with the bottom facing up.
Habitat and Distribution
The species of the genus live in slowly flowing or standing rivers and lakes in the shallow water of the riparian zones. In oxygen-rich waters, however, they can also live deep down ("foreign to the surface") with a water-filled lung cavity, so that two species ( planorbis and carinatus ) were first discovered in Lake Lunzer See in 1982 by a diver at a depth of 7 meters knew nothing before.
The genus is distributed worldwide.
The representatives of the genus Planorbis are the first intermediate hosts for Alaria alata , a suction worm which parasitizes canines.
Systematics
There are currently around 5 recent species in the genus, which are divided into two sub-genera:
- Subgenus Planorbis (Planorbis) OF Müller, 1778
- Planorbis (Planorbis) corinna Gray, 1850
- Keeled plate snail ( Planorbis (Planorbis) carinatus OF Müller, 1774)
- Common poppet snail ( Planorbis (Planorbis) planorbis (Linnaeus, 1758))
- Planorbis kahuica Finlay & Laws, 1931
- Subgenus Planorbis (Crassiplanorbis) Meier-Brook, 1976
- Planorbis (Crassiplanorbis) presbensis Sturany 1894
There are also a number of exclusively fossil forms.
literature
- Christian Albrecht, Kerstin Kuhn & Bruno Streit: A molecular phylogeny of Planorboidea (Gastropoda, Pulmonata): insights from enhanced taxon sampling. Zoologica Scripta, 36: 27-39, Oxford, 2007. doi : 10.1111 / j.1463-6409.2006.00258.x
- 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
Individual evidence
- ^ Theodor Hiepe: Textbook of Parasitology . Volume 3, Fischer-Verlag Jena, pp. 131-133. ISBN 3-437-20252-9