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 †Palaechthonidae Szalay, 1969
      Count: [†*] †6g;9s
         Genus †Palaechthon Gidley, 1923
        Count: [†*] †3s
           †Palaechthon alticuspis Gidley, 1923
          Count: -