(hypothetical_ancestor,(Proganochelys,(Proterochersis,Palaeochersis,Australochelys,(Kayentachelys,((Meiolania,Mongolochelys),(Kallokibotion,(((Platychelys,(Caribemys,(Notoemys,((Elseya,(Chelodina,Phrynops)),(Podocnemis,(Ermnochelys,Pelomedusa)))))),(Compsemys,Peltochelys,Dorsetochelys,((Pleurosternon,Glyptops,Dinochelys),(Neurankylus,(Trinitichelys,(Plesiobaena,(Boremys,(Baena,Chisternon)))))))),(Portlandemys,Plesiochelys,(Solnhofia,(Thalassemys,Santanachelys)),(Xinjianchelys,(Hangaiemys,((Judithemys,(Dracochelys,(Sinemys,Ordosemys))),((Toxochelys,((Caretta,Chelonia),(Mesodermochelys,Dermochelys))),((Protochelydra,(Macroclemmys,Chelydra)),(Platysternon,Mongolemys_elegans,Go_polyphemus,Chrysemys,Geoclemmys,Emarginachelys,Zangerlia_neimongolensis,Basilemys,Adocus,Sandownia,(Baptemys,Dermatemys,(Hoplochelys,(Staurotypus,(St_odoratus,Kinosternon)))),((Ap_spinifera,Lis_punctata),(Anosteria,Carettochelys))))))))))))))));