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Pteropoda (common name pteropods, from the Greek meaning "wing-foot") are specialized free-swimming pelagic sea snails and sea slugs, marine opisthobranch gastropods. Most live in the top 10 m of the ocean and are less than 1 cm long.
The Thecosomata (collective/plural: thecosomes, [1] meaning "case/shell-body"), [2] or sea butterflies, are a taxonomic suborder of small, pelagic, free-swimming sea snails known as holoplanktonic opisthobranch gastropod mollusks, in the order Pteropoda (also included within the informal group Opisthobranchia).
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The type locality of Limacina helicina is "Arctic seas". [1] Limacina helicina is the only thecosome pteropod in Arctic waters. [11]The distribution of Limacina helicina is arctic and subarctic (subpolar–polar) [20] especially in the Arctic Ocean and countries include:
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Cavolinia inflexa are members of the thecosome pteropod genus that dwell in the epipelagic zone feeding on arctic snow and smaller microorganisms. While it is known that Cavolinia inflexa are filters feeders, their reproductive tendencies and behaviors are not well studied.
Clione limacina, known as the naked sea butterfly, sea angel, and common clione, is a sea angel (pelagic sea slug) found from the surface to greater than 500 m (1,600 ft) depth.
Others would omit Pteropoda and use its containing clade Euopisthobranchia or subclass Heterobranchia. The other suborder of pteropods, Thecosomata , is superficially similar to sea angels, but are not closely related; some authorities include both Thecosomata and Gymnosomata as separate branches of the order Pteropoda , whereas others list ...