The small pelagic snails of the family Pneumodermatidae (Latreille, 1825) 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: Pneumoderma de Roissy, 1805
- Pneumoderma atlanticum Oken, 1815
- Pneumoderma degraaffi van der Spoel & Pafort-van Iersel, 1982
- Distribution: Sargasso Sea, Oceanic
- Length : 11.8 mm
- Pneumoderma mediterraneum van Beneden, 1838
- Distribution : Florida, Brazil, Mediterranean, Oceanic
- Length : 20 mm
- Pneumoderma peronii Lamarck, 1819
- Pneumoderma violaceum d'Orbigny, 1836
- Distribution : Bermuda, Oceanic
- Length: 25 mm
- Description : This pteropod grabs its prey with two powerful suckers, each with about 30 suctorial disks. Then it bulges out its long proboscis.
- Subspecies :
- Pneumoderma violaceum pacificum Dall, 1871
- Pneumoderma violaceum violaceum d’Orbigny, 1836
Genus: Pneumodermopsis Keferstein, 1862
- Pneumodermopsis canephora Pruvot-Fol, 1924
- Pneumodermopsis ciliata (Gegenbaur, 1855)
- Distribution : circumglobal, Oceanic
- Description : possesses five tentacles, each ending in a big suctorial disk.
- Pneumodermopsis macrochira Meisenheimer, 1905
- Pneumodermopsis michaelsarsi Bonnevie, 1913
- Distribution : Bermuda, Oceanic
- Pneumodermopsis oligocotyla Massy, 1917
- Pneumodermopsis paucidens (Boas, 1886)
- Distribution: Brazil, Oceanic
- Length : 5 mm
- Pneumodermopsis pupula Pruvot-Fol, 1926
- Pneumodermopsis spoeli Newman & greenwood, 1988
- Pneumodermopsis teschi van der Spoel, 1973
Genus Schizobrachium Meisenheimer, 1903
- Schizobrachium polycotylum Meisenheimer, 1903
Genus Spongiobranchaea d'Orbigny, 1836
- Spongiobranchaea australis d'Orbigny, 1836
- Distribution: Argentina, Australia, Subantarctic, Antarctic, Oceanic
- Length : 22 mm
- Spongiobranchaea intermedia Pruvot-Fol, 1926
Genus Abranchaea Zhan Fu-Sui, 1975
- Abranchaea chinensis Zhan Fu-Sui, 1975
Genus Platybrachium Minichev, 1976
