Class Mammalia Linnaeus, 1758 - mammals Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001 Genus †Tribotherium Sigogneau-Russell, 1991, incertae sedis [monotypic] †Tribotherium africanum Sigogneau-Russell, 1991