Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates
       Class Mammalia Linnaeus, 1758 - mammals
         Grandorder Archonta Gregory, 1910
           Mirorder Primatomorpha Beard, 1991
             Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
               Superfamily †Microsyopoidea Osborn & Wortman, 1892
                 Family †Palaechthonidae Szalay, 1969
                   Genus †Palaechthon Gidley, 1923
                     1 †Palaechthon alticuspis Gidley, 1923
                     2 †Palaechthon nacimienti
                     3 †Palaechthon woodi Gazin, 1971