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''Lingula'' is a genus of brachiopods within the class Lingulata. ''Lingula'' is known as "moule-à-queue" (tailed mussel) in New Caledonia, "bec de cane" (duck bill) along some coasts in the Indian Ocean, and "shamisen-gai" in Japan (for its likeness to the shamisen, a Japanese lute). ''Lingula'' is known to have existed possibly since the Cambrian or at least the Tertiary. Like its relatives, it has two unadorned phosphatic valves and a long fleshy stalk. Lingula lives in burrows in barren sandy coastal seafloor and feeds by filtering detritus from the water. It can be detected by a short row of three openings through which it takes in water (sides) and expels it again (middle). In Thailand, there is limited ''Lingula anatina'' fishery, where it is known as ''hoi pak ped''.〔http://www.tandfonline.com/doi/pdf/10.1080/10042857.2013.800376〕 == Living fossil == ''Lingula'' has long been considered an example of a living fossil; in fact, the perceived longevity of this genus led Darwin to coin this concept. This living fossil status is now considered unjustified however. This status is based on the shape of the shell only, and it has been shown that this shape corresponds to a burrowing lifestyle, occurring in different brachiopod lineages, with different and evolving internal structures. == Etymology == ''Lingula'' is probably derived from the Latin word for tongue "lingua" and a diminutive suffix -ula, so small tongue. Alternatively it may be derived from the Latin word for spoon (Lingula) directly. The origin of the epithet ''anatina'' is not known, but in Latin "anatina" means "belonging to the duck", possibly due to its resemblance to a duck bill. Another possible derivation could be from the French "Anatife" (goose barnacle), for its likeness.〔 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「Lingula (brachiopod)」の詳細全文を読む スポンサード リンク
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