Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       Order [Psittaciformes] Wagler, 1830 [monotypic] - parrots
         Family Psittacidae Illiger, 1811 - cockatoos and parrots
           Subfamily Psittacinae Illiger, 1811 - typical parrots
             Tribe Arini Gray, 1840
               Genus Pionus Wagler, 1832
                 Pionus maximiliani (Kuhl, 1820) - scaly-headed parrot
                   1 Pionus maximiliani maximiliani (Kuhl, 1820)
                   2 Pionus maximiliani siy Souancé, 1856
                   3 Pionus maximiliani lacerus Heine, 1884
                   4 Pionus maximiliani melanoblepharus Miranda-Ribeiro, 1920