Class [Mammalia] Linnaeus, 1758 - mammals
   Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
     Superfamily †Microsyopoidea Osborn & Wortman, 1892
       Family †Palaechthonidae Szalay, 1969
         1 Genus †Palaechthon Gidley, 1923
         2 Genus †Plesiolestes Jepsen, 1930b
         3 Genus †Talpohenach Kay & Cartmill, 1977
         4 Genus †Torrejonia Gazin, 1968
         5 Genus †Palenochtha Simpson, 1937
         6 Genus †Premnoides Gunnell, 1989