This taxon is Not Recognised as a species by BirdLife International.
Pelecanus occidentalis and P. thagus (Sibley and Monroe 1990, 1993) previously lumped into P. occidentalis following SACC (2005), are now considered distinct species following SACC (2007).
BirdLife International (2016) Species factsheet: Pelecanus occidentalis. 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.