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 Tadorninae Reichenbach - sheldrakes
             Genus Tadorna Boie, 1822
               1 Tadorna tadorna (Linnaeus, 1758) - common shelduck
               2 Tadorna radjah (Lesson, 1828) - radjah shelduck
               3 Tadorna ferruginea (Pallas, 1764) - ruddy shelduck
               4 Tadorna cana (Gmelin, 1789) - South African shelduck
               5 Tadorna tadornoides (Jardine & Selby, 1828) - Australian shelduck
               6 Tadorna variegata (Gmelin, 1789) - paradise shelduck
               7 ‡?Tadorna cristata (Kuroda, 1917) - crested shelduck