Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
Count: 1o; †6f;18g;6s
   Superfamily †Microsyopoidea Osborn & Wortman, 1892
  Count: †3f;9g;6s
     Family †Microsyopidae Osborn, 1892
    Count: †2g
       Genus †Niptomomys McKenna, 1960
      Count: -