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Pinna nobilis : ウィキペディア英語版 | Pinna nobilis
''Pinna nobilis'', common name the noble pen shell or fan mussel, is a large species of Mediterranean clam, a marine bivalve mollusc in the family Pinnidae, the pen shells. It reaches up to of shell length.〔Zavodnik, D., Hrs-Brenko, M., & Legac, M. (1991). Synopsis of the fan shell ''P. nobilis'' L. in the eastern Adriatic sea. In the C. F. Boudouresque, M. Avon, & V. Gravez (Eds.), ''Les Especes Marines a Proteger en Mediterranee'' (pp. 169–178). Marseille, France: GIS Posidonie publ.〕 ==Description== The bivalve shell is usually long,〔Acquario di Genova (2006). ''(Pinna nobilis. )'' Retrieved 15 September 2014.〕 but can reach .〔 Its shape differs depending on the region it enhabits. Like all pen shells, it is relatively fragile to pollution and shell damage. It attaches itself to rocks using a strong byssus composed of many silk-like threads which used to be made into cloth. These keratin fibres that the animal secretes by its byssus gland are even long. The inside of the shell is lined with brilliant mother-of-pearl.〔Tyndale (1849): The ''Island of Sardinia, including Pictures of the Manners and Customs of the Sardinians, . . .'' Three Volumes. John Warre Tyndale. London: Richard Bentley. pp. 77–79.〕
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