Thliptodontidae
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The small planktonic pelagic snails of the family Thliptodontidae (Kwietniewski, 1910) lack a shell (except in their early embryonic stage).They are carnivores, equipped with swimming parapoda (fleshy winglike outgrowths), strong jaws and grasping tentacles, often with suckers resembling those of cephalopods.
A more comprehensive discussion can be found under the entry Sea angel.
Genus: Thliptodon Boas, 1886
- Thliptodon antarcticus Meisenheimer, 1906
- Thliptodon diaphanus Meisenheimer 1903
- Distribution : Florida, New Zealand, Antarctica, Weddell Sea, Oceanic
- Length : 2.5 cm
- Description : rare; inhabitant of deeper water: a pair of wings extend of the middle of the body; slowest swimmer of all pteropods. Buccal apparatus with radula and large hook sacs.
- Thliptodon gegenbauri Boas, 1886
- Distribution : Mediterranean
Genus Cephalobrachia Bonnevie, 1914
- Cephalobranchia bonnevii Massy, 1917
- Cephalobranchia macrochaeta Bonnevie, 1914
- Distribution : Bermuda, Iceland, Ireland.
Genus Massya
