The white-tailed emerald and the coppery-headed emerald were formerly placed in the genus Elvira. A molecular phylogenetic study published in 2014 found that these two species were closely related to the snowcap in the genus Microchera.[4] The three species were therefore placed together in Microchera which has priority.[2]
References
^"Trochilidae". aviansystematics.org. The Trust for Avian Systematics. Retrieved 2023-08-05.
^ abGill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2020). "Hummingbirds". IOC World Bird List Version 10.2. International Ornithologists' Union. Retrieved 6 January 2020.
^Gill, F.; Donsker, D.; Rasmussen, P., eds. (August 2022). "Hummingbirds". IOC World Bird List. v 12.2. Retrieved August 9, 2022.