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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. Recently, some sources have recombined them with the Thecosomata under the Pteropoda (known as "sea butterflies").
Little is known about the Hawaiian fauna. In addition to Cliopsis krohni and Thliptodon diaphanus, three other species have been
recorded from the north Pacific near Hawaii based on the range maps in Pelagic
Molluscs:
Hydromyles globulosa
(Rang, 1825) in the family Hydromylidae
Notobranchaea inopinata
Pelseneer, 1887 in the family Notobranchaeidae
Pneumodermopsis ciliata
(Gegenbaur, 1855) in the family Pneumodermatidae
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