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 Cuculiformes Wagler, 1830 - cuckoos and plantain-eaters
Family Opisthocomidae Swainson, 1837 - hoatzins
1 Genus Opisthocomus Illiger, 1811