Phylogeny
Due to the consensus trees of the Maximum Likelihood (ML) and Bayesian
Inference (BI), we present only the ML tree for mtDNA gene cytochrome b
(cytb) gene of the S. boulengeri clades in Figure 2a. The tree
has high reconstruction confidence as the supporting values of the
internal nodes are very high.
Molecular dating supports the earliest clade divergence of W. b (from
Himalayas and QTP) to W. a (from the Hengduan Mountains) during the
Miocene (13.72 Ma). Nearly at the same period around 13.39 Ma, W. a
clade split from E. D, but, the remained clades gradually diverged
around ca. 4–8 Ma.