Trionychia

Trionychia is a superfamily of turtles which encompasses the species that are commonly referred to as softshelled turtles as well as some others. The group contains two families, Carettochelyidae, which has only one living species, the pig-nosed turtle (Carettochelys insculpta) native to New Guinea and Northern Australia, and Trionychidae, the softshelled turtles, containing numerous species native to Asia, North America and Africa. These families likely diverged during the late Jurassic. The oldest known stem-trionychian is Sinaspideretes from the Late Jurassic of China.

== Systematics == Except for those not assigned to a family, only living genera are listed here. Family Carettochelyidae Subfamily Carettochelyinae Genus Carettochelys Pan-Trionychidae Family Plastomenidae (fossil) Family Trionychidae Subfamily Cyclanorbinae Genus Cyclanorbis Genus Cycloderma Genus Lissemys Subfamily Trionychinae Genus Amyda Genus Apalone Genus Chitra Genus Dogania Genus Nilssonia Genus Palea Genus Pelochelys Genus Pelodiscus Genus Rafetus Genus Trionyx