Mammaliaformes Rowe 1988
   [crown clade] Mammalia Linnaeus, 1758 - mammals
     Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown clade] Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Placentalia Owen, 1837 - placentals
                     Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                       Preptotheria McKenna, 1975
                         Ungulata Linnaeus, 1766
                           Eparctocyona McKenna, 1975
                             Cete Linnaeus, 1758 see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
                               Cetacea Brisson, 1762 - cetaceans see Infraorder Cetacea Brisson, 1762
                                 Autoceta Haeckel, 1866
                                   Odontoceti Flower, 1867 - toothed whales
                                     Delphinoidea Gray, 1821
                                       Monodontidae Gray, 1821 - white whales
                                         Delphinapterinae Gill, 1871
                                           Delphinapterus Lacépède, 1804 - beluga