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''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.〔Bouchet, P.; Gofas, S. (2012). Limacina. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138122 on 2012-07-18〕〔http://books.google.co.uk/books?hl=en&lr=&id=yIAfwz5cxPMC&oi=fnd&pg=PA6〕 Etymological meaning of the generic name ''Limacina'' is "snail-like".〔Woodward S. P. (1854). ''A manual of the Mollusca; or, A rudimentary treatise of recent and fossil shells''. 2: (207 ). London.〕 As pelagic marine gastropods, ''Limacina'' swim by flapping their parapodia, inspiring the common name sea butterflies. Sea butterflies are part of the clade Thecosomata. Sea angels, similar to ''Limacina'', are in the order Gymnosomata. Both of these orders are still referred to as "pteropods". Sea butterflies of the order Thecosomata have a shell, while sea angels in the order Gymnosomata do not. ==Shell description== The shells of ''Limacina'' are well developed, sinistrally coiled, turret-like, and include an operculum. Shell size and thickness vary within the genus. At high latitudes, the diameter of the shell does not exceed 15 mm. At lower latitudes, the diameter varies from 1 to 3 mm. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Limacina」の詳細全文を読む スポンサード リンク
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