Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         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
                 1 Nettapus pulchellus Gould, 1842 - green pygmy-goose
                 2 Nettapus coromandelianus (Gmelin, 1789) - cotton teal
                 3 Nettapus auritus (Boddaert, 1783) - African pygmy-goose