Class [Mammalia] Linnaeus, 1758 - mammals
   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