Rough-legged Tyrannulet

The rough-legged tyrannulet (Acrochordopus burmeisteri) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay. == Taxonomy and systematics == The rough-legged tyrannulet has a complicated taxonomic history. It was originally described in 1860 by the German ornithologists Jean Cabanis and Ferdinand Heine as Phyllomyias burmeisteri. During much of the twentieth century it was placed in genus Acrochordopus, which in the 1970s was merged into Phyllomyias. In September 2023 the South American Classification Committee of the American Ornithological Society (SACC) resurrected genus Acrochordopus and moved the rough-legged tyrannulet back into it. The International Ornithological Committee (IOC) followed suit in August 2024. As of September 2024 the Clements taxonomy and BirdLife International's Handbook of the Birds of the World (HBW) retain the species in genus Phyllomyias. In addition, the rough-legged tyrannulet was formerly considered to be conspecific with the white-fronted tyrannulet (now Acrochordopus zeledoni). They were split by the SACC and IOC in the same reevaluation that led to the restoration of Acrochordopus. The SACC, IOC, Clements, and HBW all recognized the split though the last two retain the white-fronted in Phyllomyias. The rough-legged tyrannulet is monotypic…