Class [Mammalia] Linnaeus, 1758 - mammals
   Order Primates Linnaeus, 1758 - primates
     Family Cebidae Bonaparte, 1831 - New World monkeys
       Genus Alouatta Lacépède, 1799 - howler monkeys
         1 Alouatta belzebul (C. Linnaeus, 1766) - black and red howler
         2 Alouatta caraya (Humboldt, 1812) - black howler
         3 Alouatta fusca (É. Geoffroy Saint-Hilaire, 1812) - brown howler see Alouatta guariba guariba (Humboldt, 1812)
         4 Alouatta palliata (Gray, 1848[1849]) - mantled howler
         5 Alouatta seniculus (C. Linnaeus, 1766) - red howler
         6 Alouatta villosa (Gray, 1845) - Guatemalan howler see Alouatta pigra Lawrence, 1933