Orthogastropoda was a major taxonomic grouping of snails and slugs, an extremely large subclass within the huge class Gastropoda according to the older taxonomy of the Gastropoda.
Neritoidea is a taxonomic superfamily of mostly sea snails, nerites and their allies, marine gastropod mollusks in the order Cycloneritida.
The Polyceridae are a taxonomic family of sea slugs, dorid nudibranchs, marine gastropod mollusks within the superfamily Polyceroidea.
Rissoellidae are a family of minute sea snails, marine gastropod molluscs in the informal group Lower Heterobranchia.
Liotiidae is a family of small sea snails, marine gastropod mollusks in the clade Vetigastropoda.
Phasianellidae common name the "pheasant shells" or "pheasant snails" is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda.
The taxonomy of the Gastropoda, as revised by Winston Ponder and David R. Lindberg in 1997, is an older taxonomy of the class Gastropoda, the class of molluscs consisting of all snails and slugs. The full name of the work in which this taxonomy was published is Towards a phylogeny of gastropod molluscs: an analysis using morphological characters.
Doridacea is a taxonomic grouping of dorid nudibranchs, shell-less marine gastropod mollusks. included in the clade Euctenidiacea of the clade Nudibranchia.
The Euctenidiacea, common name dorid nudibranchs, are a taxonomic suborder of sea snails or slugs, marine gastropod molluscs in the order Nudibranchia. Bouchet & Rocroi (2005) rejected the name Anthobranchia on the grounds that it also included Onchidium at the time of original publication. Doridina is equivalent and used in the latest classification.
Scissurelloidea is a taxonomic superfamily of minute sea snails, marine gastropod mollusks or micromollusks in the clade Vetigastropoda.
Vanikoroidea is a superfamily of sea snails, marine gastropod molluscs in the clade Littorinimorpha. The superfamily Eulimoidea is a synonym of Vanikoroidea.
Olivoidea is a taxonomic superfamily of minute to medium-large predatory sea snails, marine gastropod mollusks in the clade Neogastropoda.
Embletoniidae is a family of sea slugs, nudibranchs, marine gastropod molluscs, in the clade Nudipleura. There are no subfamilies in the Embletoniidae.
Madrellidae is a family of nudibranchs, marine gastropod molluscs, in the clade Nudipleura. There are no subfamilies in Madrellidae.
Okadaiidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Polyceroidea. This family is within the clade Euctenidiacea.
Hermaeidae is a taxonomic family of sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks in the superfamily Plakobranchoidea.
Discodoris concinna is a species of sea slug, a dorid nudibranch, shell-less marine gastropod mollusks in the family Discodorididae.
Sebadoris fragilis is a species of sea slug, a dorid nudibranch, shell-less marine gastropod mollusks in the family Discodorididae.
Lomanotus is a genus of sea slugs, marine gastropod mollusks in the family Lomanotidae.
Margaritidae is a family of small sea snails, marine gastropod mollusks in the superfamily Trochoidea.
