Cnemarchus

Cnemarchus
	Red-rumped bush tyrant (Cnemarchus erythropygius)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Class:	Aves
Order:	Passeriformes
Family:	Tyrannidae
Genus:	Cnemarchus; Ridgway, 1905
Type species
	Taenioptera erythropygia; red-rumped bush tyrant; Sclater, 1853

Cnemarchus is a genus of South American birds in the tyrant flycatcher family Tyrannidae.

The two member of this genus are elongated, upright-perching flycatchers that share similar tail patterns. They are found at high-altitudes.

Taxonomy

The genus Cnemarchus was introduced in 1905 by the American ornithologist Robert Ridgway with the red-rumped bush tyrant as the type species. The name combines the Ancient Greek knēmos meaning "mountain-slope" with arkhos meaning "ruler" or "chief".[1]

This genus formerly contained only the red-rumped bush tyrant. Molecular phylogenetic studies published in 2020 found that the red-rumped bush tyrant was a sister to the rufous-webbed bush tyrant in the monotypic genus Polioxolmis. The two species had diverged around 4.5 million years ago.[2][3] Based on these results, the genus Polioxolmis was merged into Cnemarchus placing both species in the genus Cnemarchus.[4][5]

The genus therefore contains the following two species:[5]

Red-rumped bush tyrant (Cnemarchus erythropygius)
Rufous-webbed bush tyrant (Cnemarchus rufipennis)

References

Ridgway, Robert (1905). "Descriptions of some new genera Of Tyrannidae, Pipridae, and Cotingidae". Proceedings of the Biological Society of Washington. 18: 207–213 [208].
Chesser, R.T.; Harvey, M.H.; Brumfield, R.T.; Derryberry, E.P. (2020). "A revised classification of the Xolmiini (Aves: Tyrannidae: Fluvicolinae), including a new genus for Muscisaxicola fluviatilis". Proceedings of the Biological Society of Washington. 133 (1): 35–48. doi:10.2988/20-00005. S2CID 229241271.
Ohlson, J.I.; Irestedt, M.; Batalha Filho, H.; Ericson, P.G.P.; Fjeldså, J. (2020). "A revised classification of the fluvicoline tyrant flycatchers (Passeriformes, Tyrannidae, Fluvicolinae)". Zootaxa. 4747 (1): 167–176. doi:10.11646/zootaxa.4747.1.7. PMID 32230123.
Areta, Nacho; Pearman, Mark (September 2020). "Proposal 885: Revise the generic classification of the Xolmiini". South American Classification Committee, American Ornithologists' Union. Retrieved 26 July 2021.
Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2021). "Tyrant flycatchers". IOC World Bird List Version 11.2. International Ornithologists' Union. Retrieved 26 July 2021.

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[1] Ridgway, Robert (1905). "Descriptions of some new genera Of Tyrannidae, Pipridae, and Cotingidae". Proceedings of the Biological Society of Washington. 18: 207–213 [208].

[2] Chesser, R.T.; Harvey, M.H.; Brumfield, R.T.; Derryberry, E.P. (2020). "A revised classification of the Xolmiini (Aves: Tyrannidae: Fluvicolinae), including a new genus for Muscisaxicola fluviatilis". Proceedings of the Biological Society of Washington. 133 (1): 35–48. doi:10.2988/20-00005. S2CID 229241271.

[3] Ohlson, J.I.; Irestedt, M.; Batalha Filho, H.; Ericson, P.G.P.; Fjeldså, J. (2020). "A revised classification of the fluvicoline tyrant flycatchers (Passeriformes, Tyrannidae, Fluvicolinae)". Zootaxa. 4747 (1): 167–176. doi:10.11646/zootaxa.4747.1.7. PMID 32230123.

[4] Areta, Nacho; Pearman, Mark (September 2020). "Proposal 885: Revise the generic classification of the Xolmiini". South American Classification Committee, American Ornithologists' Union. Retrieved 26 July 2021.

[ioc-5] Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2021). "Tyrant flycatchers". IOC World Bird List Version 11.2. International Ornithologists' Union. Retrieved 26 July 2021.