Monoplacophora, meaning "bearing one plate", is a polyphyletic superclass of molluscs with a cap-like shell inhabiting deep sea environments. Extant representatives were not recognized as such until 1952; previously they were known only from the fossil record, and were thought to have become extinct 375 million years ago.
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.
The Patellogastropoda, common name true limpets and historically called the Docoglossa, are members of a major phylogenetic group of marine gastropods, treated by experts either as a clade or as a taxonomic order.
The Cocculinoidea is a superfamily of deepwater limpets, the only superfamily in the order Cocculinida, one of the main orders of gastropods according to the taxonomy as set up by. The clade Cocciliniformia used to be designated as a superorder.
Neritoidea is a taxonomic superfamily of mostly sea snails, nerites and their allies, marine gastropod mollusks in the order Cycloneritida.
Lepetellidae is a taxonomic family of small deepwater sea snails or limpets, marine gastropod molluscs in the superfamily Lepetelloidea in the clade Vetigastropoda. .
Amathinidae, is a taxonomic family mostly consisting of small and minute sea snails, marine heterobranch gastropod molluscs or micromolluscs in the superfamily Pyramidelloidea.
Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda.
Daminilidae is an extinct family of fossil sea snails, true limpets, marine gastropod mollusks in the clade Patellogastropoda. This family has no subfamilies.
Lepetopsidae is an extinct family of gastropods in the clade Patellogastropoda.
Caymanabyssiidae is a family of sea snails, marine gastropod mollusks in the vaude Vetigastropoda.
Pseudococculinidae is a family of small sea snails or false limpets, marine gastropod mollusks in the superfamily Lepetelloidea.
Abyssochrysidae is a family of sea snails, marine gastropod mollusks in the clade Caenogastropoda.
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.
Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet and Rocroi, 2005.
Cycloneritida is an order of land snails, freshwater snails, and sea snails.
Bathysciadiidae is a family of sea snails, deep-sea limpets, marine gastropod mollusks in the clade Cocculiniformia.
Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.
Neolepetopsoidea is the name of a taxonomic superfamily which is now considered to be a synonym of Lottioidea. Previously Neolepetopsoidea was considered to be a family of sea snails, marine gastropod mollusks within the clade Patellogastropoda.
Cocculinida is an order of deepwater limpets, in the subclass Neomphaliones.
