Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theria Parker & Haswell, 1897
       Infraclass Eutheria Gill, 1872
         Cohort Epitheria McKenna, 1975
           Superorder †Meridiungulata McKenna, 1975 see Grandorder Meridiungulata McKenna, 1975
             Order †Litopterna Ameghino, 1889
               Family †Macraucheniidae Gervais, 1855
                 Genus †Thesodon 1914, orth. inval. see Genus Theosodon Ameghino, 1887