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 Psittaculini Vigors, 1825
               Genus Tanygnathus Wagler, 1832
                 Tanygnathus sumatranus (Raffles, 1822) - blue-backed parrot
                   1 Tanygnathus sumatranus duponti Parkes, 1971
                   2 Tanygnathus sumatranus freeri McGregor, 1910
                   3 Tanygnathus sumatranus everetti Tweeddale, 1877
                   4 Tanygnathus sumatranus burbidgii Sharpe, 1879
                   5 Tanygnathus sumatranus sumatranus (Raffles, 1822)