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great ramshorn snail (Planorbarius corneus)
Illustration from Natural History - Mollusca (1854), p. 46 - "Planorbis corneus".
Date 1854
Source http://www.archive.org/details/naturalhistorymo00goss
Author Philip Henry Gosse (1810–1888)   
Source: https://commons.wikimedia.org/wiki/File:Natural_History_-_Mollusca_-_Planorbis_corneus.png
The great ramshorn snail (Planorbarius corneus) is a relatively large species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae. The shell of this species appears to be dextral in coiling, even though it is in fact sinistral or left-handed. |
