Class Mammalia Linnaeus, 1758 - mammals Order Primates Linnaeus, 1758 - primates Family Hylobatidae Gray, 1871 - gibbons Genus Hylobates Illiger, 1811 - gibbons Hylobates syndactylus (Raffles, 1821) - siamang see Symphalangus syndactylus (Raffles, 1821)