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Unlike other sea snails, or even land snails, sea butterflies float and swim freely through the ocean, traveling along with the currents.This has led to a number of evolutionary adaptations in their bodies, including complete or near-complete loss of the shell and the gill in several families.
Limacina helicina is a species of small swimming planktonic sea snail, in the family Limacinidae. It belongs to the group commonly known as sea butterflies (Thecosomata). [7] [8] Limacina helicina is a keystone species of mesozooplankton in Arctic pelagic ecosystems. [9] [10] [11]
Limacina is a genus of swimming predatory sea snails commonly known as sea butterflies in the family Limacinidae. This genus contains some of the world's most abundant gastropod species. [2] [3] Etymological meaning of the generic name Limacina is "snail-like". [4]
Sea angels in Australian waters. These organisms have a wide geographic range, from polar regions, under sea ice, to equatorial (tropic) seas. [2] From spring to autumn, sea angels live at a depth of 200 m in the Sea of Okhotsk. In winter, they migrate to the coast of north Hokkaido with drift ice.
Limacina retroversa is a distinct species of swimming planktonic gastropods, belonging to a group of predatory sea snails known as sea butterflies (Thecosomata). The name Limacina retroversa describes the unique morphology of this sea snail, including its slug-like body and coiled, backwards-turning shell. They are typically found in the ...
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. [ 2 ] [ 3 ] It lives in the Arctic Ocean and cold regions of the North Atlantic Ocean .
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 family Cavoliniidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks. [1] This family is part of a larger group which is commonly known as the sea butterflies because they swim by flapping what appear to be small "wings".