Figure 2

Dated phylogeny of the TST complex and outgroup taxa based on nucleotide sequences of the 13 protein-coding mitochondrial genes. Numbers above nodes indicate support values (Bayesian posterior probability/ML bootstrap support). Nodes with maximum nodal support (i.e. 1.00/100) are marked with asterisks. Nodes defining the TST phylogeny are numbered for discussion in the main text (nodes 41 to 53). Fossil calibration points are indicated with codes F1 to F4. Inset multi-plot charts show the age density distributions for two relevant nodes (the root of the tree and the origin of the TST clade) resulting from analysing the data set using each single-fossil separately or all-fossils-at-a-time as calibration points. Coloured circles on the left of the TST complex species names refer to their respective geographical distributions according to the map on Fig. 1.