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
         Genus †Niptomomys McKenna, 1960
           1 †Niptomomys doreenae McKenna, 1960
           2 †Niptomomys thelmae Gunnell & Gingerich, 1981