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 sordidus (Linnaeus, 1758) - red-billed parrot
                   1 Pionus sordidus saturatus Todd, 1915
                   2 Pionus sordidus ponsi Aveledo & Ginés, 1950
                   3 Pionus sordidus sordidus (Linnaeus, 1758)
                   4 Pionus sordidus antelius Todd, 1947
                   5 Pionus sordidus corallinus Bonaparte, 1854
                   6 Pionus sordidus mindoensis Chapman, 1925