Kingdom [Animalia] Linnaeus, 1758 - animals
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   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
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     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
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       Subdivision Bilateralia
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         Phylum Chordata Bateson, 1885 - chordates
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           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
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             Class Mammalia Linnaeus, 1758 - mammals
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               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
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                 Superorder Protungulata
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                   Order †Condylarthra Cope, 1881
                  Count: [*] †5f17g
                     Superfamily †Mesonychoidea
                    Count: [*] †1f5g
                       Family †Mesonychidae Cope, 1875
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                         Genus †Pachyaena Cope, 1874
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