Inopinaves

Inopinaves is a clade of neoavian birds recovered in a compressive genomic systematic study using nearly 200 species in 2015. It contains the clades Opisthocomiformes (hoatzin) and Telluraves (core landbirds); the study shows that the hoatzin diverged from other birds 64 million years ago.[2] 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; it could be a very derived bird that reverted to or retains some plesiomorphic traits.[3][4][5]

Inopinaves
Temporal range:
Paleocene - Holocene,
Hoatzin (Opisthocomus hoazin)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Clade: Neoaves
Clade: Inopinaves
Prum et al., 2015
Clades

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)[2][5] found very dissimilar phylogenetic relationships (like Gruae) using the same probabilistic support, such as bootstrap scores and Bayesian posterior probabilities.[6]

See also
  • Gruae for an alternative hypothesis on the placement of the hoatzin

References
  1. Daniel T. Ksepka; Thomas A. Stidham; Thomas E. Williamson (2017). "Early Paleocene landbird supports rapid phylogenetic and morphological diversification of crown birds after the K–Pg mass extinction". Proceedings of the National Academy of Sciences of the United States of America. 114 (30): 8047–8052. Bibcode:2017PNAS..114.8047K. doi:10.1073/pnas.1700188114. PMC 5544281. PMID 28696285.
  2. Prum, R.O. et al. (2015) " A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing. Nature. doi:10.1038/nature15697
  3. 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. S2CID 1296408. Archived from the original (PDF) on 2017-07-09. Retrieved 2016-07-08.
  4. Hackett, S.J. et al. (2008) A Phylogenomic Study of Birds Reveals Their Evolutionary History. Science, 320(5884):1763–1768.
  5. 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.
  6. Suh, A. (2016) The phylogenomic forest of bird trees contains a hard polytomy at the root of Neoaves, Zool. Scripta 45(S1), 50-62.


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