Nudibranchs are a group of soft-bodied marine gastropod molluscs that shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, such as "clown", "marigold", "splendid", "dancer", "dragon", and "sea rabbit". Currently, about 3,000 valid species of nudibranchs are known.
The clade Anaspidea, commonly known as sea hares, are medium-sized to very large opisthobranch gastropod molluscs with a soft internal shell made of protein. These are marine gastropod molluscs in the superfamilies Aplysioidea and Akeroidea.
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 completely lost their shells, or have seemingly lost their shells due to having a greatly reduced or internal shell. The name "sea slug" is most often applied to nudibranchs, as well as to a paraphyletic set of other marine gastropods without obvious shells.
Umbraculum, common name the "umbrella slugs" is a genus of unusual sea snails or false limpets, marine gastropod molluscs in the family Umbraculidae.
Cadlina luteomarginata, common name the yellow-edged cadlina, is a species of colorful sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Cadlinidae.
Chromodoris joshi is a species of sea slug. It is a dorid nudibranch, a shell-less marine gastropod mollusc in the family Chromodorididae.
Berthella ornata is a species of sea slug, a marine gastropod mollusk in the family Pleurobranchidae. It is sometimes called the ornate side-gilled sea slug.
Chromodoris dianae is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Chromodorididae.
Felimida krohni is a species of colorful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae. This species occurs in European waters and in the Mediterranean Sea (Greece). The specific name krohni was in honour of Russian zoologist August David Krohn.
Aiteng ater is a species of sea slug, a marine gastropod mollusc in the family Aitengidae. The specific name ater is from the Latin language and means black, in reference to the appearance of the slug on the mud.
Diaulula phoca is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Phyllidia coelestis is a species of sea slug, a nudibranch, a shell-less marine gastropod mollusc in the family Phyllidiidae.
Okenia zoobotryon is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae. It is normally found on the colonial bryozoan Amathia verticillata on which it lives and feeds.
Marionia levis is a species of dendronotid nudibranch. It is a marine gastropod mollusc in the family Tritoniidae and is found in shallow water in the Red Sea and Indian Ocean.
Phyllidiella striata is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Phyllidiidae. This nudibranch has a black dorsum with longitudinal grey-pink ridges. These ridges are tuberculate and somewhat broken. They form a circle behind the anus and a patch between the rhinophores. The rhinophores are black.
Berthella plumula, commonly known as yellow-plumed sea slug, is a gastropod mollusc usually found on rocky coasts in the infralittoral zone and which can live up to 30m depth.
Lamellaria perspicua, commonly known as the transparent lamellaria, is a species of small, slug-like sea snail, a marine gastropod mollusc in the family Velutinidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea, where it feeds on colonial ascidians.
Berthella ocellata is a species of sea slug, a marine gastropod mollusc in the family Pleurobranchidae. It is native to the eastern Atlantic Ocean and the Mediterranean Sea where it inhabits the shallow sublittoral zone.
Berthellina edwardsii is a species of sea slug, a gastropod mollusc in the family Pleurobranchidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea.
Thuridilla vataae is a species of sacoglossan sea slug, a shell-less marine opisthobranch gastropod mollusc in the family Plakobranchidae. It is native to the tropical Indo-Pacific. It was first described by the French zoologist Jean Risbec in 1928; its specific name refers to the Bay of Anse Vata, just south of Nouméa, New Caledonia, where the type specimen was collected.
