Sea slug
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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 e
The nudibranch Nembrotha aurea is a gastropod.
A sea cucumber also looks slug-like and is sometimes loosely called a "sea slug", but it is not a gastropod.
The nudibranch Glossodoris atromarginata
The sacoglossan Elysia crispata
Nudibranch
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Nudibranchs are a group of soft-bodied marine gastropod molluscs, belonging to the order Nudibranchia, that shed their shells after their larval stage. They are noted for their often extraordinary col
Sea slug
…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. Sea slugs have an enormous variation in body shape, color, and size. Most…
Berghia coerulescens
Chromodoris lochi
The unusual Bathydevius is the first known bathypelagic nudibranch
Glaucus atlanticus is an example of a nudibranch that has its cerata positioned like wings instead of on its back.