A sea butterfly.
- These all feed on pteropods, or sea butterflies, one of the species most threatened by rising acidity.
- The pteropod, Cfione limacina (Order: Gymnosomata) differs from the nudibranchs and notaspids discussed so far in that it swims continuously using paired parapodial appendages that resemble wings.
- In addition to its operation in some insects, it has been suggested that the flapping mechanism in the pteropod, Clione limacina, uses a clap-and-fling mechanism.
Mid 19th century: from modern Latin Pteropoda (plural), from Greek pteron 'wing' + pous, pod- 'foot'.
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