Mammaliaformes Rowe 1988, nom. cl. inval. see Clade Mammaliaformes Rowe 1988 [Rowe 2020]
   [crown] Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Clade Mammalia Linnaeus 1758 [Rowe 2020]
     Theriimorpha Rowe 1993
       Theria Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
         Eutheria Gill 1872 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Eutheria Gill, 1872
           Placentalia Owen 1837 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Placentalia Owen, 1837
             Epitheria McKenna 1975
               Boreoeutheria Springer & de Jong 2001 see Magnorder Boreoeutheria Springer & de Jong, 2001
                 Euarchontoglires Murphy, Stanyon & O'Brien 2001 see Superorder Euarchontoglires Murphy, Stanyon & O'Brien, 2001
                   Gliriformes Wyss & Meng 1996
                     Rodentiaformes see Pallisentis ophiocephali (Thapar, 1931)
                       Glires Linnaeus, 1758 see Superorder Glires Linnaeus, 1758
                         Simplicidentata
                           Rodentia Bowdich, 1821
                             Castorimorpha
                               1[43] †Agnotocastor sp. Stirton, 1935
                               2 Castor canadensis Kuhl, 1820 - American beaver