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
             1 Family †Purgatoriidae Van Valen & Sloan, 1965
             2 ?Family †Microsyopidae Osborn, 1892
             3 Family †Micromomyidae Szalay, 1974
             4 Family †Picromomyidae Rose & Bown, 1996
             5 ?Family †Toliapinidae Hooker, Russell & Phélizon, 1999
             6 Superfamily †Paromomyoidea Simpson, 1940
             7 Superfamily †Plesiadapoidea Trouessart, 1897