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''Chelonoidis'' is a genus of turtles in the tortoise family. They are found in South America and the Galápagos Islands. They were formerly assigned to ''Geochelone'', but a recent comparative genetic analysis has indicated that they are actually most closely related to African hingeback tortoises. Their ancestors apparently floated across the Atlantic in the Oligocene.〔 This crossing was made possible by the their ability to float with their heads up and to survive up to six months without food or water.〔 The members of this genus on the Galápagos Islands are among the largest extant terrestrial chelonians. Giant members of the genus were also present in mainland South America during the Pleistocene. == Species == Listed alphabetically.〔〔 *''C. carbonaria'' – red-footed tortoise *''C. chilensis'' – chaco tortoise *''C. denticulata'' – yellow-footed tortoise *''C. nigra'' species complex * *†''C. abingdonii'' – Pinta Island tortoise (extinct) * *''C. becki'' – Volcán Wolf Galápagos tortoise * *''C. chathamensis'' – San Cristobal Island Galápagos tortoise * *''C. darwini'' – Santiago Island Galápagos tortoise * *''C. donfaustoi'' – Eastern Santa Cruz tortoise * *''C. duncanensis'' – Pinzon Island Galápagos tortoise * *''C. guentheri'' – Sierra Negra Galápagos tortoise * *''C. hoodensis'' – Española Island Galápagos tortoise * *''C. microphyes'' – Volcán Darwin Galápagos tortoise * *†''C. nigra'' – Floreana Island Galápagos tortoise (extinct) * *†''C. phantastica'' – Fernandina Island Galápagos tortoise (doubtful existence) * *''C. porteri'' – Santa Cruz Island Galápagos tortoise * *''C. vandenburghi'' – Volcán Alcedo Galápagos tortoise * *''C. vicina'' – Isabela Island Galápagos tortoise * *†''C. wallacei'' – Rábida Island Galápagos tortoise (doubtful existence)〔〔(【引用サイトリンク】url=http://www.darwinfoundation.org/datazone/checklists/vertebrates/reptilia/ )〕 * *†''Chelonoidis sp. 1'' – Santa Fe Island Galápagos tortoise〔 (doubtful existence)〔 * *†''Chelonoidis sp. 2'' – El Fatal Island Galápagos tortoise〔 (extinct) * *†''Chelonoidis sp. 3'' – Cerro Montura Galápagos tortoise〔 (extinct) 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「Chelonoidis」の詳細全文を読む スポンサード リンク
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