Gyraulus
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Gyraulus Temporal range: Early Cretaceous - Recent, 125–0 Ma |
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_crista.JPG) |
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| Two shells of Gyraulus crista | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila |
| Superfamily: | Planorboidea |
| Family: | Planorbidae |
| Subfamily: | Planorbinae |
| Tribe: | Planorbini |
| Genus: |
Gyraulus Charpentier, 1837 |
| Type species | |
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Planorbis albus O. F. Müller, 1774 |
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| Synonyms | |
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Gyraulus is a genus of small, mostly air-breathing, freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails.
The genus Gyraulus is known from the Early Cretaceous to the present. Fossils attributed to Gyraulus sp. have been found in the lakebottom sediments of the Yixian Formation in China, dating to 125 million years ago.
The minute species Gyraulus crista, although technically a pulmonate gastropod, does not use air for respiration, but instead has a mantle cavity which has much water.
The distribution of this genus is Holarctic.
These snail snails live on water plants in freshwater.
Shell of the species within this genus are small, and are mostly almost planispiral in their coiling.
Species within the genus Gyraulus include:
subgenus Armiger W. Hartmann, 1843
subgenus Carinogyraulus Polinski, 1929: represented as Gyraulus
subgenus Gyraulus Charpentier, 1837
subgenus Lamorbis Starobogatov, 1967: represented as Gyraulis
subgenus Nautilinus Mousson, 1872
subgenus Torquis Dall, 1905
subgenus ?
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