Furthermore, the name Opisthocomus cristatus, used by some authors relatively recently (e.g.    From Wordnik.com.  [Archive 2006-11-01] Reference

Phylogenetic relationships of the enigmatic hoatzin (Opisthocomus hoazin) resolved using mitochondrial and nuclear gene sequences.    From Wordnik.com.  [Goodbye, my giant predatory, cursorial, flightless hoatzin] Reference

Hoazinoides from the Miocene of Colombia, known from a partial skull, seems to have been very similar to Opisthocomus while Onychopteryx from the Eocene of Argentina is known only from a partial tarsometatarsus and hence is not too informative.    From Wordnik.com.  [Goodbye, my giant predatory, cursorial, flightless hoatzin] Reference

Opisthocomus hoazin, also shares with Archaeopteryx clawed digits in its wings, albeit as juveniles).    From Wordnik.com.  [Conservapedia - Recent changes [en]] Reference

Pionus spp.), and hoatzins (Opisthocomus hoazin).    From Wordnik.com.  [Madeira-Tapajós moist forests] Reference