Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Myocastoridae Ameghino, 1902 1 Genus Myocastor Kerr, 1792 - nutria