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Trionychia is a superfamily of turtles which encompasses the species that are commonly referred to as softshelled turtles as well as some others. They are found throughout the temperate regions of the world. It traditionally consisted of a single family, two subfamilies, and 14 genera. However, more recently it was realized that the supposed "Kinosternoidea" are actually early offshoots of the Trionychoidea and not as closely related among each other as it was believed. These two families lack the characteristic trionychoid apomorphies, but possess some highly derived characters of their own, which they moreover evolved independently from each other. == Systematics == Except for those not assigned to a family, only living genera are listed here. *Basal and ''incertae sedis'' * * Genus †''Hoplochelys'' (fossil) * * Genus †''Emarginachelys'' (fossil) *Family Carettochelyidae * * Subfamily Carettochelyinae * * * Genus ''Carettochelys'' *Family Trionychidae * * Subfamily Plastomeninae 〔One or more basal lineages formerly believed to be a distinct family〕 (fossil) * * Subfamily Cyclanorbinae * * * Genus ''Cyclanorbis'' * * * Genus ''Cycloderma'' * * * Genus ''Lissemys'' * * Subfamily Trionychinae * * * Genus ''Amyda'' * * * Genus ''Apalone'' * * * Genus ''Chitra'' * * * Genus ''Dogania'' * * * Genus ''Nilssonia'' * * * Genus ''Palea (genus)'' * * * Genus ''Pelochelys'' * * * Genus ''Pelodiscus'' * * * Genus ''Rafetus'' * * * Genus ''Trionyx'' 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「Trionychia」の詳細全文を読む スポンサード リンク
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