This taxon is Not Recognised as a species by BirdLife International.
Campylopterus curvipennis (del Hoyo and Collar 2014) was previously split into C. curvipennis and C. excellens following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Campylopterus excellens. Downloaded from http://www.birdlife.org on 07/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/12/2016.