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''Fiona pinnata'', common name Fiona, is a species of small pelagic nudibranch (sea slug), a marine gastropod mollusk in the superfamily Fionoidea. This nudibranch species lives worldwide on floating objects on seas, and feeds mainly on barnacles, specifically goose barnacles in the genus ''Lepas''. The anatomy of this species is very unusual; it does not appear to have any living close relatives. It is the only member of the genus ''Fiona'' (the genus is thus monotypic), and the genus ''Fiona'' is in turn the only genus in the family Fionidae (a monotypic family). Features that are unique to the family Fionidae, including ''Fiona pinnata'', include:〔Willan R. C. (1979) "New Zealand locality records for the aeolid nudibranch ''Fiona pinnata'' (Eschscholtz)". ''Tane'' 25: . (PDF )〕 * the oral tentacles and rhinophores look the same * the cerata have a membrane, and have no cnidosac * the opening of the anus is directed dorsally * there are two genital openings of the reproductive system * there are two jaws with a cutting-edge * the radula looks like a column of single teeth: in each row there is only one central denticle. That one denticle has a central cusp and a few surrounding cusps. == Distribution == ''Fiona pinnata'' is found in all seas worldwide, on many different kinds of floating objects.〔(''Fiona pinnata'' (Eschscholtz, 1831) ). Sea Slug Forum. Retrieved 17 December 2009.〕 The type locality is the island location of Sitka, Alaska (Baranof Island), on the extreme northwestern coast of North America.〔 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「Fiona pinnata」の詳細全文を読む スポンサード リンク
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