Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass Theria Parker & Haswell, 1897
               Theria of Metatherian-Eutherian grade
                 Infraclass Eutheria Gill, 1872
                   Order †Litopterna Ameghino, 1889
                     1 Family †Proterotheriidae Ameghino, 1887
                     2 Family †Protolipternidae Cifelli, 1983
                     3 Family †Macraucheniidae Gervais, 1855
                     4 Family †Adianthidae Ameghino, 1891