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