This taxon is Not Recognised as a species by BirdLife International.
Bycanistes fistulator and B. sharpii (del Hoyo and Collar 2014) were previously lumped as B. fistulator following Dowsett & Forbes-Watson (1993), and before then were present in the genus Ceratogymna as C. fistulator following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Bycanistes fistulator. Downloaded from http://www.birdlife.org on 05/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 05/12/2016.