Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
         Superorder Psittacimorphae Huxley, 1867
           Order Psittaciformes Wagler, 1830 - parrots
             Family Psittacidae Illiger, 1811 - cockatoos and parrots
               Genus Pionus Wagler, 1832
                 1 Pionus menstruus (Linnaeus, 1766) - blue-headed parrot
                 2 Pionus sordidus (Linnaeus, 1758) - red-billed parrot
                 3 Pionus maximiliani (Kuhl, 1820) - scaly-headed parrot
                 4 Pionus tumultuosus (Tschudi, 1844) - speckle-faced parrot
                 5 Pionus senilis (Spix, 1824) - white-crowned parrot
                 6 Pionus chalcopterus (Fraser, 1841) - bronze-winged parrot
                 7 Pionus fuscus (Statius Müller, 1776) - dusky parrot