Pteropoda are specialized free-swimming pelagic sea snails and sea slugs, marine opisthobranch gastropods. Most live in the top 10 m of the ocean and are less than 1 cm long. The monophyly of Pteropoda is the subject of a lengthy debate; they have even been considered as paraphyletic with respect to cephalopods. Current consensus, guided by molecular studies, leans towards interpreting the group as monophyletic.
The Fasciolariidae, common name the "tulip snails and spindle snails", are a family of small to large sea snails, marine gastropod mollusks in the superfamily Buccinoidea.
The family Cavoliniidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks.
Sassia is a genus of sea snails, marine gastropod molluscs in the family Cymatiidae.
Raphitoma is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Clavatula is a genus of sea snails, marine gastropod mollusks in the family Clavatulidae.
Perrona is a genus of sea snails, marine gastropod mollusks in the family Clavatulidae.
Timbellus is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails.
Spirotropis is a genus of sea snails, marine gastropod mollusks in the family Drilliidae.
Microdrillia is a genus of very small sea snails, marine gastropod mollusks in the family Borsoniidae.
The family Hyalocylidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks.
Creseidae is a family of gastropods belonging to the order Pteropoda.
Cuvierinidae is a family of gastropods belonging to the order Pteropoda.
Creseis is a genus of gastropods belonging to the family Creseidae.
Cavolinia is a genus of gastropods belonging to the family Cavoliniidae.
Diacria is a genus of gastropods belonging to the family Cavoliniidae.
Pisanianura is a genus of sea snails, marine gastropod mollusks in the family Laubierinidae.
