Class Mammalia Linnaeus, 1758 - mammals
   Subclass Acrotheria Averianov & Lopatin, 2011
     Infraclass †"Symmetrodonta" Simpson, 1925 [paraphyletic]
       Order †Spalacotheriida Prothero, 1981 [sister group to excluded taxa]
         1 Genus †Kiyatherium Maschenko, Lopatin & Voronkevich, 2002
         2.1 Family †Zhangheotheriidae Rougier, Ji & Novacek, 2003
         2.2 Family †Spalacotheriidae Marsh, 1887