Superfamily Trionychoidea Fitzinger 1826 (turtle)
Parent taxon: Cryptodira according to W. G. Joyce 2007
Sister taxa: Acichelyidae, Adocusia, Bashuchelyidae, Chelydra, Chelydroidea, Chelyzoon, Chitracephalus, Cryptoderinea, Durocryptodira, Galvechelone, Glyptopidae, Glyptopsidae, Indochelyidae, Kayentachelyidae, Kinosternoidae, Meiolanidae, Neusticemys, Panchelonioidea, Pantrionychia, Planetochelys, Platysternoidea, Selmacryptodira, Sichuanchelys, Testudinidae, Thalassemydidae, Toxochelyidae, Trionychia, Xinjiangchelys
Subtaxa: Basilochelys, Carettochelyidae, Peltochelyidae, Trionychidae
Ecology: aquatic omnivore