Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Infraclass Eutheria Gill, 1872
       Cohort Placentalia Owen, 1837 - placentals
         Order Primates Linnaeus, 1758 - primates
           Suborder †Plesiadapiformes Simons & Tattersall, 1972
             Superfamily †Paromomyoidea Simpson, 1940
               1 Family †Palaechthonidae Szalay, 1969
               2 Family †Paromomyidae Simpson, 1940
               3 Family †Picrodontidae Simpson, 1937