Ancestral range estimation
S-DEC and S-DIVA analyses showed a highly similar biogeographic patterns for Diestramima species and the results shown in Fig. 6. The reconstructed topological tree is highly consistent with the BEAST tree, the lineages located in Guangxi and Yunnan are still the first to be diverged. The ancestral range for Diestramima in China covers mountainous region of southern Yunnan (A) and mountainous hilly region of Yunnan and Guangxi (B). As for the two clades that followed, the ancestral distribution changed from mountainous region of southern Yunnan (A, point 152) to mountainous region of southern Yunnan and low mountainous hilly region of Guangxi, Guizhou and Hunan (AC, point 145). The ancestral distribution regions of all reconstructed species in both clades include the low mountainous hilly region of Guangxi, Guizhou and Hunan (C). The species in Sichuan basin (D) came from low mountainous hilly region of Guangxi, Guizhou and Hunan (C). Jiangnan hilly region (E) and mountainous hilly region of Fujian and Guangdong (F) greatly promoted the change of the distribution of widespread species in inland China. The main dispersal routes are indicated by arrows in Fig. 7.