Class [Mammalia] Linnaeus, 1758 - mammals
   Order Primates Linnaeus, 1758 - primates
     Family Cebidae Bonaparte, 1831 - New World monkeys
       Genus Aotus Illiger, 1811 - douroucoulis
         1 Aotus azarae (Humboldt, 1811) - southern night monkey
         2 Aotus trivirgatus (Humboldt, 1811) - northern night monkey