Mammaliaformes Rowe 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511
   [crown] Class Mammalia Linnaeus, 1758 - mammals
  Ref: M.C. McKenna & S.K. Bell, 1997: 35
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
    Ref: M.C. McKenna & S.K. Bell, 1997: 36 [new rank]
       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]
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
        Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new position]
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
          Ref: M.C. McKenna & S.K. Bell, 1997: 45
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
            Ref: M.C. McKenna & S.K. Bell, 1997: 48
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
              Ref: M.C. McKenna & S.K. Bell, 1997: 48 [new rank]
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                Ref: M.C. McKenna & S.K. Bell, 1997: 49 [new rank]
                   Cohort Placentalia Owen, 1837 - placentals
                  Ref: M.C. McKenna & S.K. Bell, 1997: 80 [new rank]
                     Magnorder Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                    Ref: M.C. McKenna & S.K. Bell, 1997: 102 [new rank]
                       Superorder Preptotheria McKenna, 1975
                      Ref: M.C. McKenna & S.K. Bell, 1997: 104 [new position]
                         Grandorder Ungulata Linnaeus, 1766
                        Ref: M.C. McKenna & S.K. Bell, 1997: 357
                           Mirorder †Meridiungulata McKenna, 1975 - South American ungulates see Grandorder Meridiungulata McKenna, 1975
                          Ref: M.C. McKenna & S.K. Bell, 1997: 450
                             Order †Notoungulata Roth, 1903
                            Ref: M.C. McKenna & S.K. Bell, 1997: 455
                               Suborder †Hegetotheria Simpson, 1945
                              Ref: M.C. McKenna & S.K. Bell, 1997: 465
                                 ?Genus †Eopachyrucos Ameghino, 1901
                                Ref: M.C. McKenna & S.K. Bell, 1997: 465