Class Mammalia Linnaeus, 1758 - mammals Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001 Genus †Hypomylos Sigogneau-Russell, 1992, incertae sedis †Hypomylos micros Sigogneau-Russell, 1995