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 Probosciger Kuhl, 1820 [monotypic]
               Probosciger aterrimus (Gmelin, 1788) - palm cockatoo
                 1 Probosciger aterrimus stenolophus (van Oort, 1911)
                 2 Probosciger aterrimus goliath (Kuhl, 1820)
                 3 Probosciger aterrimus aterrimus (Gmelin, 1788)
                 4 Probosciger aterrimus macgillivrayi (Mathews, 1912)