(Proganochelys,(Australochelyidae,((Proterochersis,Pleurodira),(Kayentachelys,(((Meiolaniidae,Mongolochelys),(Sinochelyidae,Otwayemys)),((Kallokibotion,Tretosternon),(Paracryptodira,((Plesiochelyidae,Hylaeochelys),((Xinjiangchelyidae,Brodiechelys),(Sinemydidae,(Chelydroidea,(Chelonioidea,(Trionychoidea,Testudinoidea)))))))))))));