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 Phocini Gray, 1821
                                           01 Genus †Pontophoca Kretzoi, 1941
                                           02 Genus †Leptophoca True, 1906
                                           03 Genus †Praepusa Kretzoi, 1941
                                           04 Genus †Cryptophoca Koretsky & Ray, 1994
                                           05 Genus Phoca Linnaeus, 1758 - harbor, ringed, harp, and ribbon seals
                                           06 Genus †Phocanella Van Beneden, 1876
                                           07 Genus †Platyphoca Van Beneden, 1876
                                           08 Genus †Gryphoca Van Beneden, 1876
                                           09 Genus Erignathus Gill, 1866 - bearded seal
                                           10 Genus Halichoerus Nilsson, 1820 - gray seal
                                           11 Genus Cystophora Nilsson, 1820 - hooded seal