The Moustached Antwren (Myrmotherula ignota) is a species of small Neotropical bird in the Thamnophilidae family. It has two allopatric subspecies, both sometimes considered separate monotypic species: The Griscom's Antwren (M. (i.) ignota) is found the Chocó of north-western Ecuador, western Colombia and eastern Panama, and the Short-billed Antwren (M. (ignota) obscura) is found in the Amazon of north-eastern Peru, eastern Ecuador, south-eastern Colombia and north-western Brazil. The former has sometimes been considered conspecific with the Pygmy Antwren, but based on voices it has been recommended treating ignota and obscura as a subspecies of a single species. Both are found in the sub-canopy of humid lowland forests.
- BirdLife International (2012). "Myrmotherula ignota". IUCN Red List of Threatened Species. Version 2012.1. International Union for Conservation of Nature. Retrieved 16 July 2012.
- Isler, M. L, & Isler, P. R. (2003). Species limits in the pygmy antwren (Myrmotherula brachyura) complex (Aves: Passerif ormes: Thamnophilidae): 1. The taxonomic status of Myrmotherula brachyura ignota. Proceedings of the Biological Society of Washington 116(1): 23-28.
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