Class Mammalia Linnaeus, 1758 - mammals
   †"Symmetrodontans" Simpson, 1925, incertae sedis see Infraclass Symmetrodonta Simpson, 1925
     Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
       Family †Spalacotheriidae Marsh, 1887
         Subfamily †Spalacolestinae Cifelli & Madsen, 1999
           1 Genus †Spalacolestesᵀ Cifelli & Madsen, 1999
           2 ?Genus †Shalbaatar Nessov, 1997 [monotypic]
           3 Genus †Spalacotheridium Cifelli, 1990
           4 Genus †Spalacotheroides Patterson, 1955 [monotypic]
           5 Genus †Symmetrodontoides Fox, 1976