Class Mammalia Linnaeus, 1758 - mammals Order Xenarthra Cope, 1889 - xenarthrans see Magnorder Xenarthra Cope, 1889 Family Bradypodidae Batsch, 1788 - three-toed tree sloths Genus Bradypus Linnaeus, 1758 - three-toed tree sloths Bradypus variegatus Schinz, 1825 - brown-throated sloth