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The genus Clio is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks, the sole genus belonging to the family Cliidae 〔Bouchet, P.; Gofas, S. (2012). Clio. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137751 on 2012-07-24〕 All species in this genus are characterised by a bilaterally symmetric, straight or adapically dorso-ventrally slightly curved shell, with an elliptical to triangular transverse section; protoconch clearly separated, globular or elliptical, frequently with a spine at the tip. Subgenera are used for some species (e.g. ''Clio'' s.str., ''Balantium'' Bellardi, 1872, ''Bellardiclio'' Janssen, 2004), but most species cannot yet be assigned to one of these. Numerous fossil species have been described. ==Species== Recognised extant species are: * ''Clio andreae'' (Boas, 1886) * * Distribution : north Atlantic, bathypelagic species. * ''Clio antarctica'' Dall, 1908 * ''Clio bartletti'' van der Spoel, 1978 * * Distribution: central Atlantic (Pleistocene fossil). * ''Clio campylura'' (Tesch, 1948) * ''Clio chaptalii'' J. E. Gray, 1850 * * Distribution : tropical, circumglobal. * ''Clio convexa convexa'' (Boas, 1886) * * Distribution: tropical, Indo-Pacific * ''Clio convexa cyphosa'' Rampal, 2002 * * Distribution: Red Sea and Gulf of Aden. * ''Clio cuspidata'' (Bosc, 1802) * * Distribution : tropical/subtropical, circumglobal. * † ''Clio oblonga'' Rampal, 1996 * ''Clio orthotheca'' (Tesch, 1904) * ''Clio piatkowskii'' van der Spoel, Schalk & Bleeker, 1992 * * Distribution: Antarctic. * ''Clio polita'' Pelseneer, 1888 * ''Clio pyramidata'' Linnaeus, 1767 * * Distribution : north Atlantic * * Height : to over 20 mm. Formae: * * * forma ''excisa'' van der Spoel, 1963 * * * forma ''lanceolata'' Lesueur, 1813 (tropical/subtropical, circumglobal) * * * forma ''martensi'' (Pfeiffer, 1880) ?? * * * forma ''sulcata'' (Pfeffer, 1879) The true status of these formae has to be evaluated, they might be real formae, subspecies, or even species. * ''Clio recurva'' (Children, 1823) * * Distribution : tropical-subtropical, circumglobal (bathypelagic species) * * * * * Height: to over 30 mm * Clio sulcata (Pfeffer, 1879) ;Species brought into synonymy: * ''Clio australis'': synonym of ''Clione limacina australis'' (Bruguière, 1792) * ''Clio borealis'' (Pallas, 1774): synonym of ''Clione limacina'' (Phipps, 1774) * ''Clio helicina'' Phipps, 1774: synonym of Limacina helicina (Phipps, 1774) 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「Clio (gastropod)」の詳細全文を読む スポンサード リンク
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