Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family ‡Heptaxodontidae Anthony, 1917 Subfamily ‡Heptaxodontinae Anthony, 1917 see Family Heptaxodontidae Anthony, 1917 Genus ‡Quemisia Miller, 1929 ‡Quemisia gravis Miller, 1929