Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Psittaciformes Wagler, 1830 - parrots
           Family Psittacidae Illiger, 1811 - cockatoos and parrots
             Subfamily Psittacinae Illiger, 1811 - typical parrots
               Genus Pionus Wagler, 1832
                 Pionus chalcopterus (Fraser, 1841) - bronze-winged parrot
                 Pionus fuscus (Statius Müller, 1776) - dusky parrot
                 Pionus maximiliani (Kuhl, 1820) - scaly-headed parrot
                 Pionus menstruus (Linnaeus, 1766) - blue-headed parrot
                 Pionus senilis (Spix, 1824) - white-crowned parrot
                 Pionus seniloides Massena & Souancé, 1854 see Pionus tumultuosus seniloides (Massena & Souancé, 1854)
                 Pionus sordidus (Linnaeus, 1758) - red-billed parrot
                 Pionus tumultuosus (Tschudi, 1844) - speckle-faced parrot