|Taxonomic Notes :||Monotypic. Previously considered conspecific with Alpine Thrush Zoothera mollissima and Sichuan Forest Thrush Zoothera griseiceps under the name Plain-backed Thrush Zoothera mollissima.
Note that the three sister species are so similar that it has not been possible to positively identify many of the images to species. Such images of Zoothera mollissima sunsu lato are featured on OBI under Alpine Thrush Zoothera mollissima.
Alström, Per; Rasmussen, Pamela C.; Zhao, Chao; Xu, Jingzi; Dalvi, Shashank; Cai, Tianlong; Guan, Yuyan; Zhang, Ruiying; Kalyakin, Mikhail V.; Lei, Fumin; Olsson, Urban (2016). "Integrative taxonomy of the Plain-backed Thrush (Zoothera mollissima) complex (Aves, Turdidae) reveals cryptic species, including a new species". Avian Research 7 (1): 1–39.