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Great ram's horn snail (Planorbarius corneus). This snail is a relatively large species of air-breathing freshwater snail. All planorbids have sinistral or left-coiling shells here in a small lake in Danube Delta, Romania.
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Great ram's horn snail (Planorbarius corneus). This snail is a relatively large species of air-breathing freshwater snail. All planorbids have sinistral or left-coiling shells here in a small lake in Danube Delta, Romania.