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Temporal range: Late Eocene - Recent, Late Eocene–0
Hoatzins in Brazil.jpg
Hoatzin (Opisthocomus hoazin)
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Clade: Inopinaves
Order: Opisthocomiformes
L'Herminier, 1837
Family: Opisthocomidae
Swainson, 1837
  • Foratidae Olson 1992
  • Hoazinoididae Rasmussen 1997
  • Onychopterygidae Cracraft 1971

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]


Based on the work of Mayr & De Pietri 2014.[2]







  1. ^ Mayr G., Alvarenga H., Mourer-Chauviré C. (2011). "Out of Africa: Fossils shed light on the origin of the hoatzin, an iconic Neotropic bird". Naturwissenschaften. 98 (11): 961–6. doi:10.1007/s00114-011-0849-1. PMID 21964974.
  2. ^ a b Gerald Mayr and Vanesa L. De Pietri (2014). "Earliest and first Northern Hemispheric hoatzin fossils substantiate Old World origin of a "Neotropic endemic"". Naturwissenschaften. 101 (2): 143–148. doi:10.1007/s00114-014-1144-8. PMID 24441712.
  3. ^ Mikko's Phylogeny Archive [1] Haaramo, Mikko (2007). "Primitive Land-bird Assemblage". Retrieved 30 December 2015.

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