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Planorbis
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Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.
Description
Planorbis shells are flat-coiled and sinistral.
Distribution
This genus has a worldwide distribution. It is known from the Jurassic to the Recent periods.
Species
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