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 Atelidae Gray, 1825
               Subfamily Alouattinae (Trouessart, 1897) Elliot, 1904
                 Genus Alouatta Lacépède, 1799 - howler monkeys
                   Alouatta guariba (Humboldt, 1812)
                     1 [Alouatta guariba guariba]ᵀ (Humboldt, 1812)
                     2 Alouatta guariba clamitans Cabrera, 1940