After McKenna & Bell, 1997, and Zack, Penkrot, Krause & Maas, 2005

    Ungulata

        Tubulidentata

            OrycteropodidaeDinocerataUintatheriidae Flower, 1876
              including:GobiatheriidaeGobiatheriinaeGobiatheriidaeUintatheriinae Flower, 1876


        Altungulata
            Paenungulata
            ?Taxeopoda Cope, 1882

            †MeniscotheriidaePhenacodontidaeLoxolophidaeArctocyonidae: LoxolophinaePhenacolophidae

            PantomesaxoniaEmbrithopoda Andrews, 1906
                    †Embrithopoda Andrews; Prothero & Schoch, 1989

                    †Arsinoitheriidae Andrews, 1904
                        †Arsinotheriidae Andrews, 1904 (lapsus calami)

                Perissodactyla Owen, 1848
                    Mesaxonia; Prothero & Schoch, 1989

                Uranotheria

                     Hyracoidea Huxley, 1869

                        †Pliohyracidae Osborn, 1899

                            †Geniohyinae Andrews, 1906
                                †Geniohyinae Matsumoto, 1926

                            †Saghatheriinae Andrews, 1906

                            †Titanohyracinae Matsumoto, 1926

                            †Pliohyracinae Osborn, 1899
                                †Pliohyracinae Matsumoto, 1926

                        Procaviidae Thomas, 1892
                            Hyracidae Gray, 1821


                Tethytheria

                    Sirenia Illiger, 1811

                        †Prorastomidae Cope, 1889
                            †Prorastomatidae Flower & Lydekker, 1891
                            †Prorastominae Reinhart, 1959

                        †Protosirenidae Sickenberg, 1934

                        Dugongidae Gray, 1821
                            HalicoridaeHalitheriinae Carus, 1868
                                †Halitheriinae Carus; Abel, 1913
                            Dugonginae Gray, 1821
                                Dugongidae Gray, 1821
                                Dugonginae Simpson, 1932
                              including:
                                Rytiodontinae Abel, 1914

                            †MetaxytheriinaeHydrodamalinae Palmer, 1895
                                †Hydrodemalidae Palmer, 1895
                                †Hydrodemalinae Simpson, 1932

                        Manatidae
                            Trichechidae Gill, 1872
                            Miosireninae Abel, 1919
                                †Miosireninae Abel; Domning, 1994

                            Trichechinae Gill, 1872
                                Trichechidae Gill, 1872
                                Trichechinae Domning, 1994

                     BehemotaDesmostylia Reinhart, 1953

                            †Desmostylidae Osborn, 1905
                              including:Cornwallidae Shikama, 1957
                                †Paleoparadoxidae Reinhart, 1953


                        Proboscidea Illiger, 1811


        EparctocyonaProcreodi; McKenna & Bell, 1997
                †Arctocyonia Van Valen, 1969

                †Quettacyonidae Gingerich, Abbas & Arif, 1997
                    †Quettacyoninae Gingerich, Abbas & Arif, 1997 [Arctocyonidae:]

                †Oxyclaenidae“Protungulatidae”Arctocyonidae Giebel, 1855

            †Bulbulodentata Archibald, 1998
                †Condylartha; McKenna & Bell, 1997

                    †Apheliscidae Matthew, 1918
                        †Apheliscinae Matthew, 1918
                      including:Louisininae Sudre & Russell, 1982

                    †Panameriungulata de Muizon, & Cifelli, 2000
                        †Mioclenidae
                          including:Hyopsodontidae Lydekker, 1889

                    †MeridiungulataArctostylopida; Cifelli and Schaff, 1998

            Paraxonia




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