This taxon is Not Recognised as a species by BirdLife International.
Caloramphus fuliginosus and C. hayii (del Hoyo and Collar 2014) were previously lumped as Calorhamphus fuliginosus following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Caloramphus fuliginosus. Downloaded from http://www.birdlife.org on 02/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 02/12/2016.