Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Chinchillidae Bennett, 1833 - viscachas and chinchillas Genus Lagidium Meyen, 1833 - mountain viscachas Lagidium wolffsohni (Thomas, 1907) - Wolffsohn's mountain viscacha