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''Ocadia'' is a genus of turtles in the family Geoemydidae (formerly called Bataguridae). It is sometimes included in ''Mauremys''.〔Honad ''et al.'' (2002), Feldman & Parham (2004), Spinks ''et al.'' (2004)〕 It contains the following species: * Chinese stripe-necked turtle, ''O. sinensis'' ''O. sinensis'' is known to hybridize with most other Geoemydidae genera.〔see Vetter & Van Dijk (2006)〕 Hybridization runs rampant in that family; while it is possible that perfectly valid species could arise this way, the other ''Ocadia'' species are apparently only known from a few specimens each, all of them purchased from a turtle dealer in Hong Kong: The supposed species "''Ocadia glyphistoma''", described by Mccord & Iverson in 1994 and supposedly from southern Guangxi and northern Vietnam, is a hybrid between a male ''O. sinensis'' and a female Vietnamese pond turtle (''Mauremys annamensis'').〔Spinks ''et al.'' (2004), Stuart & Parham (2006)〕 This "species" seems to be naturally occurring in central Vietnam, but is occasionally also bred for the pet trade in southern Chinese turtle farms.〔Blanck ''et al.'' (in prep.)〕 Philippen's striped turtle (''"Ocadia philippeni''"), described by Mccord & Iverson in 1992 and said to occur on Hainan, also proved to be a hybrid, between a male ''O. sinensis'' and a female ''Cuora trifasciata''.〔Stuart & Parham (2006)〕 It is not proven but likely that this "species" also originates from both the wild and is bred in farms. In 2013, a Miocene Japanese fossil species of the same genus was described, ''Ocadia tanegashimensis'' Takahashi & al.,〔( Akio Takahashi, Kimihiko Ōki, Takahiro Ishido, & Ren Hirayama, 2013, "A new species of the genus ''Ocadia'' (Testudines: Geoemydidae) from the middle Miocene of Tanegashima Island, southwestern Japan and its paleogeographic implications" )〕 which adds itself to the already known Pleistocene ''O. nipponica'', from the same country. ==References== *Conserv Genet (2007) 8:169–175 * (2005): On the hybridisation between two distantly related Asian turtles (Testudines: ''Sacalia'' × ''Mauremys''). ''Salamandra'' 41: 21-26. (PDF fulltext ) * (2001): New Chinese turtles: endangered or invalid? A reassessment of two species using mitochondrial DNA, allozyme electrophoresis and known-locality specimens. ''Animal Conservation'' 4(4): 357–367. (HTML abstract ) Erratum: ''Animal Conservation'' 5(1): 86 (HTML abstract ) nl:Ocadia 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「Ocadia」の詳細全文を読む スポンサード リンク
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