Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Passeriformes
Subordo: Tyranni
Infraordo: Tyrannides
Parvordo: Tyrannida
Familia: Tyrannidae
Subfamilia: Fluvicolinae
Genus: Cnemarchus
Species: C. erythropygius – C. rufipennis
Name
Cnemarchus Ridgway, 1905
Typus: Taenioptera erythropygia P.L. Sclater, 1853 = Cnemarchus erythropygius
Synonyms
Polioxolmis W. Lanyon, 1986
References
Primary references
Ridgway, R. 1905. Descriptions of some new genera of Tyrannidae, Pipridae, and Cotingidae. Proceedings of the Biological Society of Washington. 18: 207-210. Washington. BHL Reference page. Original description p. 208 BHL
Additional references
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 Open access Reference page.
Chesser, R.T., Harvey, M.G., Brumfield, R.T. & Derryberry, E.T. 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 Paywall Reference page.
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.
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.
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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