(Eutypomys_thompsoni,((Neatocastor_hesperus,(Anchitheriomys,(Migmacastor_procumbodens,((Agnotocastor_coloradensis,Agnotocastor_praetereadens),(Euroxenomys_minutum,(Priusaulax,((Palaeocastor_wahlerti,(((Palaeocastor_cf_simplicidens,(Agnotocastor_sp,Palaeocastor_sp_2)),(Palaeocastor_peninsulatus,((Brachycastor_wangi,(Pseudopaleocastor_barbouri,(Fossorcastor_greeni,(Euhapsis_breugerom,Euhapsis_ellicotae)))),(Palaeocastor_fossor,Palaeocastor_magnus)))),(Capacikala_sp_1,(Capacikala_sp_2,Palaeocastor_cf_nebrascensis)))),(((Dipoides_tanneri,(Sinocastor_anderssoni,(Castor_fiber,Hystricops_venustus))),(((Trogontherium_cuvieri,(Castoroides_ohioensis,Procastoroides_idahoensis)),(Dipoides_cf_intermedius,Dipoides_stirtoni)),(Dipoides_smithi,Eucastor_tortus))),(Steneofiber_depereti,Steneofiber_eseri))))))))),(Pseudotomus_robustus,(Paramys_copei,Paramys_delicatus))));