Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
       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
                   1 Genus †Navajovius Matthew & Granger, 1921
                   2 Genus †Berruvius Russell, 1964
                   3 Genus †Niptomomys McKenna, 1960
                   4 Genus †Uintasorex Brown & Rose, 1976
                   5 Genus †Avenius Russell, Phélizon & Louis, 1992
                   6 Genus †Microsyops Leidy, 1872
                   7 Genus †Arctodontomys Gunnell, 1985
                   8 Genus †Craseops Stock, 1934
                   9 Genus †Megadelphus Gunnell, 1989