Cnemarchus
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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
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