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Sea butterfly

The Thecosomata (collective/plural: thecosomes, from Ancient Greek (thḗkē), meaning "case", and (sôma), meaning "body"), or sea butterflies, are a taxonomicsuborder of small, pelagic, free-swimming sea snails known as holoplanktonicopisthobranchgastropodmollusks, in the orderPteropoda (also included within the informal group Opisthobranchia).

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