Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
       [Order] Anseriformes Wagler, 1831 - waterfowl and screamers
         Family Anatidae Vigors, 1825 - ducks, geese, swans
           Subfamily Anatinae Vigors, 1825 - pond ducks
             Genus Nettapus Brandt, 1836 - green pygmy-goose
               Nettapus coromandelianus (Gmelin, 1789) - cotton teal
                 1 Nettapus coromandelianus coromandelianus (Gmelin, 1789)
                 2 Nettapus coromandelianus albipennis Gould, 1842