[Mammalia] Linnaeus, 1758 - mammals
   †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
     †Microsyopoidea Osborn & Wortman, 1892
       †Microsyopidae Osborn, 1892
         †Arctodontomys Gunnell, 1985
           1 †Arctodontomys wilsoni (Szalay, 1969)
           2 †Arctodontomys simplicidens (Rose, 1981)
           3 †Arctodontomys nuptus (Cope, 1882)