Malurus grayi and M. campbelli (Campbell's Fairywren) (Sibley and Monroe 1990, 1993) have been lumped into M. grayi following Beehler et al. (1986), Coates (1990) and Vuilleumier et al. (1992).
A 2011 analysis by Amy Driskell and colleagues of mitochondrial and nuclear DNA showed high divergence between the two subspecies and has recommended they be resplit into separate species. It also found them to lie in a clade with the two other monospecific New Guinea genera and not with the other species of Malurus. Hence they recommend reclassifying them within the genus Chenorhamphus.
- Driskell, Amy C. ; Norman, Janette A. ; Pruett-Jones, Stephen ; Mangall, Elizabeth ; Sonsthagen, Sarah ; Christidis, Les (2011). "A multigene phylogeny examining evolutionary and ecological relationships in the Australo-papuan wrens of the subfamily Malurinae (Aves)". Molecular Phylogenetics and Evolution 60: 480–85. doi:10.1016/j.ympev.2011.03.030. PMID 21466855.
- BirdLife International 2004. Malurus grayi. 2006 IUCN Red List of Threatened Species. Downloaded on 26 July 2007.
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