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

Little is known about Hawaiian species. However, five have been recorded from the north Pacific near Hawaii based on the range maps in Pelagic Molluscs on the Marine Species Identification Portal:
 
Cliopsis krohni Troschel, 1854 in the family Cliopsidae
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

Of these, Cliopsis krohni is the closest to the islands on the maps.
 
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