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 [Columbiformes] Latham, 1790 - pigeons and allies
         Family Columbidae Illiger, 1811 - doves, pigeons
           Subfamily Treroninae
             Genus Ducula Hodgson, 1836
               Ducula aenea (Linnaeus, 1766) - green imperial-pigeon
                 01 Ducula aenea sylvatica (Tickell, 1833)
                 02 Ducula aenea pusilla (Blyth, 1849)
                 03 Ducula aenea andamanica Abdulali, 1964
                 04 Ducula aenea nicobarica (Pelzeln, 1865)
                 05 Ducula aenea consobrina (Salvadori, 1887)
                 06 Ducula aenea oenothorax (Salvadori, 1892) - Enggano imperial-pigeon
                 07 Ducula aenea polia (Oberholser, 1917)
                 08 Ducula aenea palawanensis (Blasius, 1888)
                 09 Ducula aenea fugaenis (Hachisuka, 1930)
                 10 Ducula aenea nuchalis (Cabanis, 1882)
                 11 Ducula aenea aenea (Linnaeus, 1766) - green imperial-pigeon
                 12 Ducula aenea intermedia (Meyer & Wiglesworth, 1894)
                 13 Ducula aenea paulina Bonaparte, 1854