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 †Proterotheriidae Ameghino, 1887
Genus †Thoatherium Ameghino, 1887