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 †Symmetrodonta Simpson, 1925 - symmetrodonts see Infraclass Symmetrodonta Simpson, 1925
          Ref: M.C. McKenna & S.K. Bell, 1997: 44
             Order †Spalacotherioidea Prothero, 1981 see Order Spalacotheriida Prothero, 1981
            Ref: M.C. McKenna & S.K. Bell, 1997: 45
               1 Family †Tinodontidae Marsh, 1887
              Ref: M.C. McKenna & S.K. Bell, 1997: 45
               2 Family †Spalacotheriidae Marsh, 1887
              Ref: M.C. McKenna & S.K. Bell, 1997: 45
               3 Family †Barbereniidae Bonaparte, 1990
              Ref: M.C. McKenna & S.K. Bell, 1997: 45