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Melanopareia bitorquata (d’Orbigny & Lafresnaye, 1837) is a distinct species: an appraisal of morphological variation in the Collared Crescentchest Melanopareia torquata (zu Wied-Neuwied, 1831) (Aves: Melanopareiidae)

. Zootaxa. 4193, 1 (Nov. 2016), 138–150. DOI:https://doi.org/10.11646/zootaxa.4193.1.6.