Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Cercopithecidae Gray, 1821 - Old World monkeys Subfamily Cercopithecinae Gray, 1821 Genus Allenopithecus Lang, 1923 - Allen's monkey 1 Allenopithecus nigroviridis (Pocock, 1907) - Allen's swamp monkey