Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Abrocomidae Miller & Gidley, 1918 - chinchilla-rats 1 Genus Abrocoma Waterhouse, 1837 - chinchilla rats