Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Order Anseriformes Wagler, 1831 - waterfowl and screamers Family Anhimidae Stejneger, 1885 - screamers