Phylum Chordata Bateson, 1885 - chordates
Class Aves Linnaeus, 1758 - birds
see Subclass Aves Linnaeus, 1758
Subclass Neornithes Gadow, 1893
see Clade Neornithes Gadow, 1893
Superorder Neognathae Pycraft, 1900
see Cohort Neognathae Pycraft, 1900
Order Anseriformes Wagler, 1831 - waterfowl and screamers
Family Anhimidae Stejneger, 1885 - screamers
Genus Chauna Illiger, 1811
1 Chauna torquata (Oken, 1816) - southern screamer
2 Chauna chavaria (Linnaeus, 1766) - northern screamer