Class [Mammalia] Linnaeus, 1758 - mammals
Count: -
   Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
  Count: [†*] †9f;44g;99s
     Superfamily †Microsyopoidea Osborn & Wortman, 1892
    Count: [†*] †2f;15g;27s
       Family †Microsyopidae Osborn, 1892
      Count: [†*] †9g;18s
         1 Genus †Navajovius Matthew & Granger, 1921
        Count: [†*] †1s
         2 Genus †Berruvius Russell, 1964
        Count: [†*] †2s
         3 Genus †Niptomomys McKenna, 1960
        Count: [†*] †2s
         4 Genus †Uintasorex Brown & Rose, 1976
        Count: [†*] †1s
         5 Genus †Avenius Russell, Phélizon & Louis, 1992
        Count: [†*] †1s
         6 Genus †Microsyops Leidy, 1872
        Count: [†*] †6s
         7 Genus †Arctodontomys Gunnell, 1985
        Count: [†*] †3s
         8 Genus †Craseops Stock, 1934
        Count: [†*] †1s
         9 Genus †Megadelphus Gunnell, 1989
        Count: [†*] †1s