Mammaliaformes Rowe 1988
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Cohort Placentalia Owen, 1837 - placentals
                     Magnorder Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                       Superorder Preptotheria McKenna, 1975
                         Grandorder Ferae Linnaeus, 1758
                           Order Carnivora Bowdich, 1821 - carnivores
                             Suborder Caniformia Kretzoi, 1943
                               Infraorder Arctoidea Flower, 1869
                                 Parvorder Ursida Tedford, 1976
                                   Superfamily Phocoidea Gray, 1821
                                     Family Phocidae Gray, 1821 - true seals
                                       Subfamily Phocinae Gray, 1821 - true seals, earless seals, hair seals
                                         Tribe Monachini Gray, 1869
                                           Subtribe Monachina Gray, 1869
                                             01 Genus †Palmidophoca Ginsburg & Janvier, 1975
                                             02 Genus †Monachopsis Kretzoi, 1941
                                             03 Genus †Monotherium Van Beneden, 1876
                                             04 Genus †Pristiphoca Gervais, 1852
                                             05 Genus †Properiptychus Ameghino, 1897, nom. nud.
                                             06 Genus †Messiphoca de Muizon, 1981
                                             07 Genus †Mesotaria Van Beneden, 1876, nom. dub.
                                             08 Genus †Callophoca Van Beneden, 1876
                                             09 Genus †Pliophoca Tavani, 1942
                                             10 Genus Mirounga Gray, 1827 - elephant-seals
                                             11 Genus Monachus Fleming, 1822 - monk seals