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 Merganetta Gould, 1842 [monotypic]
               Merganetta armata Gould, 1842 - torrent duck
                 1 Merganetta armata colombiana Des Murs, 1845 - Colombian torrent-duck
                 2 Merganetta armata leucogenis (Tschudi, 1843) - Peruvian torrent-duck
                 3 Merganetta armata turneri Sclater & Salvin, 1869
                 4 Merganetta armata garleppi Berlepsch, 1894
                 5 Merganetta armata berlepschi Hartert, 1909
                 6 Merganetta armata armata Gould, 1842 - Chilean torrent-duck