Multilocus, phenotypic, behavioral, and ecological niche analyses provide evidence for two species within Euphonia affinis (Aves, Fringillidae).
Vázquez-López M, Morrone JJ, Ramírez-Barrera SM, López-López A, Robles-Bello SM, Hernández-Baños BE. Zookeys. 2020; 952:129-157. Epub 2020 Jul 23.