The Limacinidae are a family of small sea snails, pteropods, pelagic marine gastropod mollusks in the clade Thecosomata.
Limacina is a genus of swimming predatory sea snails commonly known as sea butterflies in the family Limacinidae. This genus contains some of the world's most abundant gastropod species.
The Clionidae are a family of sea angels, which are a group of pelagic marine gastropods.
Fowlerina, one kind of "sea angel", is a genus of small sea slugs, marine opisthobranch gastropod mollusks in the family Clionidae.
Atlantidae is a family of sea snails, holoplanktonic gastropod molluscs in the clade Littorinimorpha.
Atlanta is a genus of pelagic marine gastropod molluscs in the family Atlantidae. They are sometimes called heteropods.
Carinariidae, known by the common name "heteropods" like their relatives in the Pterotracheoidea, is a taxonomic family of swimming or floating sea snails, pelagic marine gastropod molluscs in the clade Littorinimorpha.
Carinaria is a genus of medium-sized floating sea snails, pelagic gastropod molluscs in the family Carinariidae.
Cardiapoda placenta, common name the flat cardiapod, is a species of sea snail, a rare pelagic gastropod mollusc in the family Carinariidae.
Pterotracheidae is a family of medium-sized to large floating sea snails, pelagic gastropod molluscs. They are in the superfamily Pterotracheoidea along with two other similar pelagic families, the Atlantidae and the Carinariidae.
Collisella was a genus of primitive sea snails, specifically true limpets, marine gastropod mollusks in the family Lottiidae, one of the families of true limpets. This genus has become a synonym of Lottia Gray, 1833
Peraclidae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea.
Scissurella is a genus of minute sea snails, marine gastropod molluscs in the family Scissurellidae, the small slit snails.
Anatoma is a genus of minute marine gastropod molluscs or micromolluscs in the family Anatomidae, found in Europe, Australia and New Zealand.
Brookula is a genus of minute sea snails or micromolluscs, marine gastropod molluscs unassigned in the superfamily Seguenzioidea.
Velutinidae is a family of small sea snails, marine gastropod molluscs in the clade Littorinimorpha.
Phidiana is a genus of sea slugs, aeolid nudibranchs, marine gastropod molluscs in the family Facelinidae.
Cardiapoda richardi is a species of sea gastropod, a holoplanktonic marine gastropod mollusk in the family Carinariidae.
Opalia is a genus of small sea snails, marine gastropod mollusks in the family Epitoniidae, commonly known as wentletraps.
