Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Cercopithecidae Gray, 1821 - Old World monkeys Subfamily Colobinae Jerdon, 1867 Genus Nasalis Geoffroy Saint-Hilaire, 1812 - proboscis monkey Subgenus Simias Miller, 1903 see Genus Simias Miller, 1903