Class [Mammalia] Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Family Myocastoridae Ameghino, 1902 Genus Myocastor Kerr, 1792 - nutria 1 Myocastor coypus (Molina, 1782) R. Kerr, 1792 - coypu