The genus name Onychorhynchus comes from the Greek words ὄνυξonyx "nail" and ρυγχοςrhynkhos "bill".[2] The specific epithet of the type species, coronatus, and the common name royal flycatcher, refer to the striking, colorful crest,[3] which is seen displayed very rarely,[3] except after mating, while preening, in courtship as well as being handled.[3]
The taxonomies of the genus and of the family Tityridae remain unsettled. HBW retains the four-species treatment.[5] The Clements taxonomy recognizes the same two species of royal flycatcher as the IOC. However, Clements places them and five other species in family Onychorhynchidae, rather than in Tityridae like the IOC.[7][1] The North American and South American Classification Committees of the American Ornithological Society (AOS) treat genus Onychorhynchus as having one species, the royal flycatcher (O. coronatussensu lato), with multiple subspecies. Like Clements the AOS committees place the royal flycatcher in family Onychorhynchidae. They lump two of the Clements species and like Clements place the resulting four species in Onychorhynchidae. The South American committee is seeking a proposal for reevaluation of the taxa.[8][9]
The IOC and Clements recognize these two species in genus Onychorhynchus.[1][7]
Southern Mexico through Central America, western Colombia, western Ecuador, and the Amazon Basin in northern Bolivia, eastern Peru, eastern Ecuador, eastern Colombia, Venezuela, the Guianas, and northern and western Brazil
^ abcRidgely, Robert and John A. Gwynne Jr. (1989). A Guide to the Birds of Panama with Costa Rica, Nicaragua, and Honduras. Princeton University Press. ISBN0691025126.
^ abClements, J. F., P.C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, M. Smith, and C. L. Wood. 2024. The eBird/Clements checklist of birds of the world: v2024. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved October 23, 2024
^Chesser, R. T., S. M. Billerman, K. J. Burns, C. Cicero, J. L. Dunn, B. E. Hernández-Baños, R. A. Jiménez, O. Johnson, A. W. Kratter, N. A. Mason, P. C. Rasmussen, and J. V. Remsen, Jr. 2024. Check-list of North American Birds (online). American Ornithological Society. https://checklist.americanornithology.org/taxa/ retrieved August 22, 2024
^Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 28 September 2024. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved September 29, 2024