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''Otukaia'' is a genus of medium-sized sea snails, marine gastropod molluscs in the family Calliostomatidae, the top shells. ''Otukaia'' has long been considered a subspecies of Calliostoma and is still treated as such by many authorities. Snails in this genus are characterized by their relatively large, silky-white, thin shell. They lack an umbilicus. Their spiral whorls are flat to slightly convex. The first three spiral cords can show some sculpture that may persist on later whorls. They have a rachidian radula. They can be found world-wide in deep water. Some authors use ''Otukaia'' Ikebe, 1942 as a subgenus in ''Calliostoma'' Swainson, 1840.〔WoRMS (2010). ''Otukaia'' Ikebe, 1942. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=456482 on 2010-04-22〕 The (sub)generic name ''Otukaia'' is in honor of the Japanese malacologist Yanosuke Otuka (1903–1950), who described the type species ''Calliostoma kiheiziebisu'' Otuka, 1939.〔 Otuka Y. (1939). "日本産エビスガヒ屬の一新種 A new ''Calliostoma'' from Japan". ''Venus'' 9(1): 27–29. (CiNii ).〕 == Species == Species in the genus ''Otukaia'' include:〔Powell A. W. B., ''New Zealand Mollusca'', William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1〕〔(NZ Mollusca )〕 * ''Otukaia blacki'' Dell, 1956 * ''Otukaia chilena'' (Rehder, 1971) * ''Otukaia crustulum'' Vilvens & Sellanes, 2006〔Vilvens & Sellanes (2006). ''The Nautilus'' 120(1): 15-20.〕 * ''Otukaia delli'' McLean & Andrade, 1982 * ''Otukaia eltanini'' Dell, 1990 * ''Otukaia kiheiziebisu'' Otuka, 1939 - synonym: ''Calliostoma kiheiziebisu'' Otuka, 1939. - the type species of the subgenus ''Otukaia''.〔http://www.gastropods.com/Taxon_pages/Family_CALLIOSTOMATIDAE_CALLIOSTOMATINAE.shtml accessed 16 June 2010〕 * ''Otukaia otukai'' Ikebe, 1942 * ''Otukaia rossica'' (Dall, 1919) - Russian margarite Synonyms: * ''Otukaia ikukoae'' Sakurai, 1994 is a synonym of ''Otukaia kiheiziebisu'' (Otuka, 1939)〔WoRMS (2010). ''Calliostoma ikukoae'' (Sakurai, 1994). In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467203 on 2011-04-24〕 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「Otukaia」の詳細全文を読む スポンサード リンク
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