Mammaliaformes Rowe, 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511
   [crown clade] Mammalia Linnaeus, 1758
  Ref: M.C. McKenna & S.K. Bell, 1997: 35
     Theriiformes Rowe, 1988, new rank
    Ref: M.C. McKenna & S.K. Bell, 1997: 36 [new rank]
       Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995, new rank
      Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new rank]
         Trechnotheria McKenna, 1975
        Ref: M.C. McKenna & S.K. Bell, 1997: 43 [new position]
           Cladotheria McKenna, 1975
          Ref: M.C. McKenna & S.K. Bell, 1997: 45
             Zatheria [McKenna, 1975]
            Ref: M.C. McKenna & S.K. Bell, 1997: 48
               Tribosphenida McKenna, 1975:27, new rank
              Ref: M.C. McKenna & S.K. Bell, 1997: 48 [new rank]
                 [crown clade] Theria Parker & Haswell, 1897:448, new rank
                Ref: M.C. McKenna & S.K. Bell, 1997: 49 [new rank]
                   Placentalia Owen, 1837:903, new rank
                  Ref: M.C. McKenna & S.K. Bell, 1997: 80 [new rank]
                     Epitheria McKenna, 1975, new rank
                    Ref: M.C. McKenna & S.K. Bell, 1997: 102 [new rank]
                       Preptotheria [McKenna, 1975]
                      Ref: M.C. McKenna & S.K. Bell, 1997: 104 [new position]
                         Anagalida [Szalay & McKenna, 1971]
                        Ref: M.C. McKenna & S.K. Bell, 1997: 104-105
                           Simplicidentata Weber, 1904, new rank
                          Ref: M.C. McKenna & S.K. Bell, 1997: 113 [new rank]
                             Rodentia [Bowdich, 1821]
                            Ref: M.C. McKenna & S.K. Bell, 1997: 114 [new position]
                               Hystricognatha [Woods, 1976]
                              Ref: M.C. McKenna & S.K. Bell, 1997: 191
                                 Hystricognathi [Tullberg, 1899]
                                Ref: M.C. McKenna & S.K. Bell, 1997: 191
                                   Bathyergomorphi Tullberg, 1899, new rank
                                  Ref: M.C. McKenna & S.K. Bell, 1997: 195 [new rank]
                                     Bathyergidae [Waterhouse, 1841]
                                    Ref: M.C. McKenna & S.K. Bell, 1997: 195 [new position]
                                       1 Bathyerginae [Waterhouse, 1841]
                                      Ref: M.C. McKenna & S.K. Bell, 1997: 195
                                       2 Heterocephalinae [Landry, 1957]
                                      Ref: M.C. McKenna & S.K. Bell, 1997: 196