Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Caviidae Fischer de Waldheim, 1817 - cavies and Patagonian "hares" Subfamily Caviinae Fischer de Waldheim, 1817 Genus Microcavia Gervais & Ameghino, 1880 - mountain cavies Microcavia australis (I. Geoffroy & d'Orbigny, 1833) - southern mountain cavy