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Gymnosomata
The order Gymnosomata (often referred to as "sea angels") includes specialized pelagic predators that lack shells and use an expanded portion of the foot for swimming. Most have elongate bodies. In older literature, they are often included with the Thecosomata in the order Pteropoda (known as "sea butterflies").

Little is known about the Hawaiian fauna. In addition to Cliopsis krohni, four other species have been recorded from the north Pacific near Hawaii based on the range maps in Pelagic Molluscs on the Marine Species Identification Portal:

Hydromyles globulosa (Rang, 1825) in the family Hydromylidae
Notobranchaea inopinata Pelseneer, 1887 in the family Notobranchaeidae
Pneumodermopsis ciliata (Gegenbaur, 1855) in the family Pneumodermatidae
Thliptodon diaphanus (Meisenheimer, 1903) in the family Clionidae



Cliopsidae


 
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