[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
     Order Anseriformes Wagler, 1831 - waterfowl and screamers
       Family Anatidae Vigors, 1825 - ducks, geese, swans
         1 Genus Somateria Leach, 1819
         2 Genus Clangula Leach, 1819
         3 Genus Melanitta Boie, 1822