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 Dendrocygninae Reichenbach - tree-ducks
             Genus Thalassornis Eyton, 1838 [monotypic]
               1 Thalassornis leuconotos Eyton, 1838 - white-backed duck see Thalassornis leuconotus Eyton, 1838