Class Mammalia Linnaeus, 1758 - mammals Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001 Family †Pappotheriidae Slaughter, 1965, incertae sedis [monotypic] Genus †Pappotherium Slaughter, 1965 [monotypic] †Pappotherium pattersoni Slaughter, 1965