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
                 1 Genus †Macrauchenia Owen, 1838
                 2 Genus †Thesodon 1914, orth. inval. see Genus Theosodon Ameghino, 1887