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 Sarkidiornis Eyton, 1838 [monotypic]
               Sarkidiornis melanotos (Pennant, 1769) - comb duck
                 1 Sarkidiornis melanotos melanotos (Pennant, 1769) - African comb-duck
                 2 Sarkidiornis melanotos sylvicola Ihering & Ihering, 1907 - American comb-duck