Mammaliaformes Rowe 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511; Count: [g†g] 1c;24o;125f;1081g; ‡1o;6f;43g; †24o;301f;4057g;1s
   [crown] Class Mammalia Linnaeus, 1758 - mammals
  Ref: M.C. McKenna & S.K. Bell, 1997: 35; Count: [g†g] 24o;125f;1081g; ‡1o;6f;43g; †21o;294f;4034g;1s
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
    Ref: M.C. McKenna & S.K. Bell, 1997: 36 [new rank]; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †21o;294f;4031g;1s
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
      Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new rank]; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †20o;277f;3936g;1s
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
        Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new position]; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †20o;274f;3932g
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
          Ref: M.C. McKenna & S.K. Bell, 1997: 45; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †18o;269f;3910g
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
            Ref: M.C. McKenna & S.K. Bell, 1997: 48; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †16o;262f;3884g
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
              Ref: M.C. McKenna & S.K. Bell, 1997: 48 [new rank]; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †16o;258f;3877g
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                Ref: M.C. McKenna & S.K. Bell, 1997: 49 [new rank]; Count: [g†g] 22o;123f;1078g; ‡1o;6f;43g; †16o;256f;3874g
                   Cohort Placentalia Owen, 1837 - placentals
                  Ref: M.C. McKenna & S.K. Bell, 1997: 80 [new rank]; Count: [g†g] 17o;108f;1005g; ‡1o;5f;40g; †12o;218f;3610g
                     Magnorder Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                    Ref: M.C. McKenna & S.K. Bell, 1997: 102 [new rank]; Count: [g†g] 15o;103f;992g; ‡4f;34g; †12o;208f;3390g
                       Superorder Preptotheria McKenna, 1975
                      Ref: M.C. McKenna & S.K. Bell, 1997: 104 [new position]; Count: [g†g] 15o;103f;992g; ‡4f;34g; †12o;204f;3358g
                         Grandorder Anagalida Szalay & McKenna, 1971 see Order Anagalida Szalay & McKenna, 1971
                        Ref: M.C. McKenna & S.K. Bell, 1997: 104-105; Count: [g†g] 2o;27f;445g; ‡11g; †2o;34f;835g
                           Mirorder Simplicidentata Weber, 1904
                          Ref: M.C. McKenna & S.K. Bell, 1997: 113 [new rank]; Count: [g†g] 1o;24f;429g; ‡10g; †1o;30f;745g
                             Order Rodentia Bowdich, 1821 - rodents
                            Ref: M.C. McKenna & S.K. Bell, 1997: 114 [new position]; Count: [g†g] 24f;429g; ‡10g; †29f;733g
                               Suborder Hystricognatha Woods, 1976 see Suborder Hystricomorpha Brandt, 1855
                              Ref: M.C. McKenna & S.K. Bell, 1997: 191; Count: [g†g] 14f;53g; ‡3g; †9f;171g
                                 Infraorder Hystricognathi Tullberg, 1899
                                Ref: M.C. McKenna & S.K. Bell, 1997: 191; Count: [g†g] 14f;53g; ‡3g; †8f;170g
                                   Parvorder Caviida Bryant & McKenna, 1995 see Parvorder Caviomorpha Wood & Patterson, 1955
                                  Ref: M.C. McKenna & S.K. Bell, 1997: 196; Count: [g†g] 9f;40g; ‡3g; †3f;137g
                                     Superfamily Octodontoidea Waterhouse, 1839
                                    Ref: M.C. McKenna & S.K. Bell, 1997: 203; Count: [g†g] 3f;26g; ‡3g; †1f;59g
                                       Family Octodontidae Waterhouse, 1840 - octodonts
                                      Ref: M.C. McKenna & S.K. Bell, 1997: 203; Count: [g†g] 7g; †16g
                                         Subfamily Octodontinae Waterhouse, 1839
                                        Ref: M.C. McKenna & S.K. Bell, 1997: 204 [new rank]; Count: [g†g] 7g; †9g
                                           Tribe Octodontini Waterhouse, 1839
                                          Ref: M.C. McKenna & S.K. Bell, 1997: 204 [new rank]; Count: [g†g] 6g; †2g
                                             Genus Octodontomys Palmer, 1903 - chozchoz
                                            Ref: M.C. McKenna & S.K. Bell, 1997: 204 [new position]; Count: -