This taxon is Not Recognised as a species by BirdLife International.
Phapitreron amethystinus, P. maculipectus and P. frontalis (del Hoyo and Collar 2014) were previously lumped as P. amethystinus following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Phapitreron amethystinus. Downloaded from http://www.birdlife.org on 03/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 03/12/2016.