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Trimusculus
''Trimusculus'' is a genus of medium-sized air-breathing sea snails or false limpets, marine pulmonate gastropod molluscs in the family Trimusculidae.
''Trimusculus'' is the only genus in the family Trimusculidae.〔 de Bruyne R. H. (2004). ''Encyklopedie ulit a lastur''. Rebo Productions, 336 pp., ISBN 80-7234-288-6, page 227.〕 Trimusculidae, the button snails, is the only family in the superfamily Trimusculoidea,〔 a superfamily of false limpets. These are marine pulmonate gastropod mollusks in the clade Eupulmonata.
Trimusculids are ''not'' very closely related to the siphonariids, another family of marine air-breathing false-limpets. The trimusculids are in the clade Eupulmonata, and are quite closely related to air-breathing land snails.
==Description==
Trimusculids are sometimes known as "button shells" or "button snails" because, especially in the eastern Pacific species ''Trimusculus reticulatus'', the shells are small, white, almost perfectly circular in outline, only moderately elevated, and thus the shells are somewhat reminiscent of traditional white shirt buttons.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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