Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs, are gastropods, i.e. they are sea snails that, over evolutionary time, have either entirely lost their shells or have seemingly lost their shells due to having a significantly reduced or internal shell. The name "sea slug" is often applied to nudibranchs and a paraphyletic set of other marine gastropods without apparent shells.
Elysia timida is a species of sacoglossan sea slug, a marine opisthobranch gastropod mollusk. Found in the Mediterranean and nearby parts of the Atlantic, it is herbivorous, feeding on various algae in shallow water.
Flabellina affinis is a species of sea slug within the clade of aeolid nudibranch; a marine gastropod mollusk in the family Flabellinidae.
The gasflame nudibranch is a very colourful species of nudibranch, or sea slug. It is a marine gastropod mollusc in the family Proctonotidae. Bonisa nakaza is the only species in the genus Bonisa.
Doto coronata is a species of small sea slug or nudibranch, a shell-less marine gastropod mollusc in the family Dotidae. It is the type species of the genus Doto.
Phyllodesmium pecten is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.
Flabellina engeli is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Flabellinidae.
Ziminella japonica is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Paracoryphellidae.
Cratena peregrina, commonly called the pilgrim hervia, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.
Doto acuta is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto escatllari is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto sabuli is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto floridicola is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto eireana is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto sarsiae is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Doto hydrallmaniae is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Dotidae.
Calmella is a genus of sea slugs, aeolid nudibranchs, marine gastropod mollusks in the family Flabellinidae.
Doto africoronata is a species of small sea slug or nudibranch, a shell-less marine gastropod mollusc in the family Dotidae.
Aplysia morio, the Atlantic black sea hare or sooty sea hare, is a species of sea slug, a marine gastropod mollusk in the family Aplysiidae, the sea hares. It lives in warm waters in the Caribbean Sea and off the south and southeastern coast of the United States, where it feeds on seaweed.
Palisa papillata is a species of sea slug, specifically an aeolid nudibranch. It is a marine gastropod mollusc in the family Facelinidae. It is the only species in the genus Palisa.
