The Hoatzins (Opisthocomiformes) - Order
(Opisthocomidae) - family
(Foro) -extinct- (Hoatzi) -extinct- (Onychopteryx) -extinct- (Protoazin) -extinct-


(Foro panarium)
-extinct-


(Hoatzi panarium)
-extinct-


(Onychopteryx simpsoni)
-extinct-


(Protoazin parisiensis)
-extinct-
(Namibiavis) -extinct- (Hoatzinavis) -extinct- (Hoatzinoides) -extinct- (Opisthocomus)


(Namibiavis senutae)
-extinct-


(Hoatzinavis lacustris)
-extinct-


(Hoatzinoides magdalenae)
-extinct-

Hoatzin
(Opisthocomus hoazin)