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Temporal range: Late Eocene - Recent, Late Eocene–0
Hoatzins in Brazil.jpg
Hoatzin (Opisthocomus hoazin)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Clade: Gruae
Order: Opisthocomiformes
L'Herminier, 1837
Family: Opisthocomidae
Swainson, 1837
Type species
Phasianus hoazin
Muller, 1776


Opisthocomidae is a group of birds, the only named family within the order Opisthocomiformes. The only living representative is the hoatzin (Opisthocomus hoazin) which lives in the Amazon and the Orinoco delta in South America. Several fossil species have been identified, including one from Africa[1] and one from Europe.[2]


  1. ^ Mayr, G., Alvarenga, H. and Mourer-Chauviré, C. (2011). "Out of Africa: Fossils shed light on the origin of the hoatzin, an iconic Neotropic bird." Naturwissenschaften, doi:10.1007/s00114-011-0849-1 PMID 21964974
  2. ^ Gerald Mayr and Vanesa L. De Pietri (2014). "Earliest and first Northern Hemispheric hoatzin fossils substantiate Old World origin of a "Neotropic endemic"". Naturwissenschaften. in press. doi:10.1007/s00114-014-1144-8.