Inopinaves is a clade of neoavian birds recovered in a compressive genomic systematic study using nearly 200 species in 2015, that contains the clades Opisthocomiformes (Hoatzin) and Telluraves (core landbirds); the study shows that the Hoatzin diverged from other birds 64 million years ago.[1] Previous studies have placed the Hoatzin in different parts of the bird family tree; however, despite its unusual morphology, genetic studies have shown the hoatzin is not as primitive or as ancient as once thought, and that it could be a very derived bird that reverted to or retains some plesiomorphic traits.[2][3][4]

Temporal range: Paleocene–Recent
4 day trip to La Selva Lodge on the Napo River in the Amazon jungle of E. Ecuador - Hoatzin (Opisthocomus hoazin) - (26592958760).jpg
Hoatzin (Opisthocomus hoazin)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Clade: Neoaves
Clade: Inopinaves
Prum et al., 2015

According to Suh et al. (2016), one of the problems with the conclusions about this novel clade is that independent studies (like Jarvis et al. 2014 and Prum et al. 2015)[1][4] found very dissimilar phylogenetic relationships (like Gruae) using the same probabilistic support, such as bootstrap scores and Bayesian posterior probabilities.[5]

See alsoEdit

  • Gruae for an alternative hypothesis on the placement of the Hoatzin


  1. ^ a b Prum, R.O. et al. (2015) " A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing. Nature. doi:10.1038/nature15697
  2. ^ Fain, Matthew G.; Houde, Peter (2004). "Parallel radiations in the primary clades of birds" (PDF). Evolution. 58 (11): 2558–2573. doi:10.1554/04-235. PMID 15612298. Archived from the original (PDF) on 2017-07-09. Retrieved 2016-07-08.
  3. ^ Hackett, S.J. et al. (2008) A Phylogenomic Study of Birds Reveals Their Evolutionary History. Science, 320(5884):1763–1768.
  4. ^ a b Jarvis, E.D. et al. (2014) Whole-genome analyses resolve early branches in the tree of life of modern birds. Science, 346(6215):1320-1331.
  5. ^ Suh, A. (2016) The phylogenomic forest of bird trees contains a hard polytomy at the root of Neoaves, Zool. Scripta 45(S1), 50-62.