Sea lemon is a loosely applied common name for a group of medium-sized to large shell-less colorful sea slugs or nudibranchs, specifically dorid nudibranchs in the taxonomic family Dorididae and other closely related families. These are marine gastropod mollusks.
Nudibranchs belong to the order Nudibranchia, 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.
Diaulula sandiegensis, commonly known as the San Diego dorid or the ringed dorid, is a species of sea slug or nudibranch, a marine gastropod mollusc in the suborder Doridina and the family Discodorididae.
Peltodoris nobilis, commonly called the sea lemon, false sea lemon, or the noble dorid, is a species of colorful sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae.
Chromodoris lochi, common name Loch's chromodoris, or Loch’s chromodoris slug, is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Peltodoris atromaculata, more commonly known as the dotted sea slug or sea cow, is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Discodorididae. It dwells in salt water up to the depth of 40m. It is exclusively found in precorralligene and coralligene communities and is very common in such communities.
The three-spot nudibranch, scientific name Aldisa trimaculata, is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Cadlinidae.
Discodorididae is a taxonomic family of sea slugs, specifically dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea.
Chromodoris strigata, commonly known as the streaked chromodoris, is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Diaulula is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Discodorididae.
Peltodoris is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Discodorididae.
Chromodoris africana, or four-coloured nudibranch, is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Hypselodoris maculosa is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Hypselodoris saintvincentius is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Montereina is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Discodorididae.
Tyrinna evelinae is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Diaulula greeleyi is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Diaulula phoca is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Trapania goslineri is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.
Diaulula odonoghuei, the spotted leopard dorid, is a species of dorid nudibranch found in the Pacific Ocean. Identified as a cryptic species in 2016, it is differentiated from its sister species Diaulula sandiegensis by having considerably more spots on their mantle.
