Order Anseriformes Wagler, 1831 - waterfowl and screamers Suborder Anseres Linnaeus, 1758 - waterfowl Family Anatidae Vigors, 1825 - ducks, geese, swans Subfamily Aythyinae Delacour & Mayr, 1945 - scaups see Subfamily Anatinae Vigors, 1825 1 Genus Aythya Boie, 1822 - hardhead