Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Primates Linnaeus, 1758 - primates
       Suborder Haplorrhini Pocock, 1918 see Suborder Haplorhini Pocock, 1918
         Infraorder Simiiformes Haeckel, 1866
           Parvorder Platyrrhini Geoffroy Saint-Hilaire, 1812
             Family Aotidae Poche, 1908
               Genus Aotus Illiger, 1811 - douroucoulis
                 .1 gray-necked species group
                 .2 red-necked species group
                 1 Aotus azarae (Humboldt, 1811) - southern night monkey
                 2 Aotus hershkovitzi Ramirez-Cerquera, 1983
                 3 Aotus lemurinus (I. Geoffroy Saint-Hilaire, 1843)
                 4 Aotus miconax Thomas, 1927
                 5 Aotus nancymaae Hershkovitz, 1983
                 6 Aotus nigriceps Dollman, 1909
                 7 Aotus trivirgatus (Humboldt, 1811) - northern night monkey
                 8 Aotus vociferans (Spix, 1823)