Class Mammalia Linnaeus, 1758 - mammals
   Order Primates Linnaeus, 1758 - primates
     Family Cercopithecidae Gray, 1821 - Old World monkeys
       Subfamily Cercopithecinae Gray, 1821
         Genus Mandrillus Ritgen, 1824 - forest baboons
           1 Mandrillus leucophaeus (F. Cuvier, 1807) - drill
           2 Mandrillus sphinx (C. Linnaeus, 1758) - mandrill