This taxon is Not Recognised as a species by BirdLife International.
Gerygone hypoxantha, treated as a species in Collar and Andrew (1988) and subsequently, is now considered a subspecies of G. magnirostris following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Gerygone hypoxantha. 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.