This taxon is Not Recognised as a species by BirdLife International.
Clytorhynchus nigrogularis (Sibley and Monroe 1990, 1993) has been split into C. nigrogularis and C. sanctaecrucis following Dutson (2006).
BirdLife International (2016) Species factsheet: Clytorhynchus nigrogularis. Downloaded from http://www.birdlife.org on 06/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 06/12/2016.