Figure 7 in Towards completing the crocodile newts' puzzle with all-inclusive phylogeographic resources

Figure 7. Simultaneous diversification (splitting events) through time in crocodile newts (blue bars) and the similarly surveyed South-East/East Asian tree frog genus Zhangixalus (green bars; Dufresnes et al., 2022), overlaid by Earth temperature (red curve). The latter is shown as the difference with the average temperature over the 1960–90 period, combining the datasets from Zachos et al. (2008), Hansen et al. (2013) and Lisiecki & Raymo (2005). In both amphibians, ancestral clades diverged in the Early Miocene and probably expanded throughout Asia during the Miocene climatic optimum; extant clades and species then appeared as the climate progressively cooled down and the South-East Asian monsoon strengthened in the Late Miocene onwards, and recently accelerated during the Pleistocene Quaternary glaciations. Photos: E. maxiquadratus (credit: AH) and Z. chenfui (credit: S. N. Litvinchuk).