Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]
   Clade Epicynodonts Hopson & Kitching 2001
     Clade Eucynodontia Kemp 1982 [Rowe 1993]
       Clade Mammaliamorpha Rowe 1988
         Class Mammalia Linnaeus, 1758 - mammals
           Clade Trechnotheria McKenna 1975
             Family †Spalacotheriidae Marsh, 1887
               Subfamily †Spalacolestinae Cifelli & Madsen, 1999
                 1 ?Genus †Shalbaatar Nessov, 1997
                 2 Genus †Spalacolestes Cifelli & Madsen, 1999
                 3 Genus †Spalacotheridium Cifelli, 1990
                 4 Genus †Spalacotheroides Patterson, 1955
                 5 Genus †Symmetrodontoides Fox, 1976