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 Cacatuinae del Hoyo et al., 2014 see Family Cacatuidae Gray, 1840
             Genus Cacatua Vieillot, 1817
               Cacatua pastinator (Gould, 1841) - western corella
                 Cacatua pastinator derbyi (Mathews, 1916)