Planorbis

Rarity: Common

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At a glance

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Planorbis”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ehrmann, Hermann Felix Paul (* 21st December 1868 – † 6th October 1937; Germany), Public domain, via Wikimedia Commons.