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 Family †Purgatoriidae Van Valen & Sloan, 1965