Rostanga is a genus of sea slugs in the family Discodorididae. Some sources, such as The Sea Slug Forum still classify Rostanga in the family Dorididae.
The Clionidae are a family of sea angels, which are a group of pelagic marine gastropods.
Limapontiidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks.
Elysia is a genus of sea slugs, marine gastropod molluscs in the family Plakobranchidae. These animals are colorful sea slugs, and they can superficially resemble nudibranchs, but are not very closely related to them. Instead they are sacoglossans, commonly known as sap-sucking slugs.
Goniodorididae are a taxonomic family of sea slugs, specifically dorid nudibranchs, marine gastropod molluscs in the order Opisthobranchia.
Chelidonura is a genus of small, sometimes colorful, sea slugs. These are headshield slugs or cephalaspideans, marine opisthobranch gastropod mollusks in the family Aglajidae.
Patella is a genus of sea snails with gills, typical true limpets, marine gastropod mollusks in the family Patellidae, the true limpets.
Atagema is a genus of sea slugs, specifically dorid nudibranchs. They are marine gastropod molluscs in the family Discodorididae.
Onchidoris is a genus of dorid nudibranchs in the family Onchidorididae. One of its members is known to prey on barnacles and the others eat bryozoans. The radula contains a rachidian tooth when fully developed, but this is vestigial in some species.
Baptodoris is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Discodorididae.
Thordisa is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Discodorididae.
Fryeria is a genus of sea slugs, dorid nudibranchs, shell-less marine gastropod molluscs in the family Phyllidiidae.
Hermaea is a genus of sacoglossan sea slugs, a shell-less marine opisthobranch gastropod mollusks in the family Hermaeidae.
Obtusella is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae.
Velutina is a genus of small sea snails, marine gastropod mollusks in the family Velutinidae.
Berthella is a genus of sea slugs, marine gastropod mollusks in the family Pleurobranchidae.
Facelina is a genus of sea slug, an aeolid nudibranch in the family Facelinidae.
Crenella is a genus of bean mussels in the family Mytilidae.
After excluding groups not related, the informal group Sigmurethra has become the suborder Helicina, with the following infraorders and a collection of families with no superfamily：
