| Tylodina perversa | |
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| A live individual of Tylodina perversa, head end towards the top | |
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| Species: | T. perversa
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| Binomial name | |
| Tylodina perversa (Gmelin, 1791)
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Tylodina perversa, common names the "yellow tylodina" or "yellow umbrella slug", is a species of sea snail or false limpet, a marine opisthobranch gastropod mollusk in the family Tylodinidae.
This opisthobranch has a limpet-like shell which is composed primarily of protein, not calcium carbonate.