(Hypothetical_ancestor,(Proganochelys_quenstedti,(Proterochersis_robusta,Palaeochersis_talampayensis,Australochelys_africanus,(Kayentachelys_aprix,Eileanchelys_waldmani,Heckerochelys_romani,Condorchelys_antiqua,(Kallokibotion_bajazidi,Dorsetochelys_delairi,Portlandemys_mcdowelli,Plesiochelys_solodurensis,Solnhofia_parsonsi,Thalassemys_moseri,Santanachelys_gaffneyi,Xinjiangchelys_latimarginalis,Hangaiemys_hoburensis,Judithemys_sukhanovi,Dracochelys_bicuspis,Protochelydra_zangerli,Platysternon_megacephalum,Mongolemys_elegans,Gopherus_polyphemus,Chrysemys_picta,Geoclemys_hamiltonii,Peltochelys_durlstonensis,Sandownia_harrisi,(Meiolania_platyceps,Mongolochelys_efremovi),(Platychelys_oberndorferi,Caribemys_oxfordiensis,Notoemys_laticentralis,(Elseya_dentata,(Chelodina_oblonga,Phrynops_geoffroanus)),(Erymnochelys_madagascariensis,Pelomedusa_subrufa,Podocnemis_expansa)),((Pleurosternon_bullockii,(Glyptops_plicatulus,Dinochelys_whitei)),(Neurankylus_eximius,(Trinitichelys_hiatti,(Plesiobaena_antiqua,(Boremys_pulchra,(Baena_arenosa,Chisternon_undatum)))))),(Sinemys_lens,Ordosemys_leios),(Toxochelys_latiremis,((Caretta_caretta,Chelonia_mydas),(Mesodermochelys_undulatus,Dermochelys_coriacea))),(Macroclemys_temminckii,Chelydra_serpentina),(Emarginachelys_cretacea,((Baptemys_wyomingensis,Dermatemys_mawii),(Hoplochelys_crassa,(Staurotypus_triporcatus,(Sternotherus_odoratus,Kinosternon_flavescens))))),(Adocus_beatus,(Zangerlia_neimongolensis,Basilemys_variolosa)),((Apalone_spinifera,Lissemys_punctata),(Anosteira_ornata,Carettochelys_insculpta)))))));