This taxon is Not Recognised as a species by BirdLife International.
Zoothera dauma (Sibley and Monroe [1990, 1993]) and Z. imbricata (Collar ) have been lumped together into Z. dauma and subsequently split into Z. dauma, Z. major and Z. aurea following del Hoyo and Collar (2016).
BirdLife International (2020) Species factsheet: Zoothera dauma. Downloaded from http://www.birdlife.org on 03/04/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 03/04/2020.