| Planorbarius corneus | |
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| A live individual of Planorbarius corneus, carrying the shell with the umbilicus uppermost | |
| Conservation status | |
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NE
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila |
| Superfamily: | Planorboidea |
| Family: | Planorbidae |
| Genus: | Planorbarius |
| Species: | P. corneus |
| Binomial name | |
| Planorbarius corneus (Linnaeus, 1758)[1] |
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| Subspecies | |
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| Synonyms | |
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Planorbarius corneus, common name the great ramshorn, is a relatively large species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral or left-coiling shells.
The shell of this species appears to be dextral in coiling, even though it is in fact sinistral or left-handed.
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The native range of this pond snail is from Europe to central Asia.
All species within family Planorbidae have sinistral shells.
This large planorbid is found in water which is still, or only moving slowly, where there is a good growth of many different kinds of pond weeds, and where there are high levels of calcium dissolved in the water.[6]
Planorbarius corneus under high temperatures has been studied by Kartavykh & Podkovkin (2002).[7]
This species of snail functions as a host for several parasite species: