Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates
       Class Mammalia Linnaeus, 1758 - mammals
         Grandorder Archonta Gregory, 1910
           Mirorder Primatomorpha Beard, 1991
             Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
               Superfamily †Microsyopoidea Osborn & Wortman, 1892
                 Family †Microsyopidae Osborn, 1892
                   Genus †Microsyops Leidy, 1872
                     †Microsyops annectens (Marsh, 1872)