Control region gene (D-loop) distribution of
from mainland Southeast Asia. The shape of the symbols corresponds to the clades defined in Figure 6. Unk = unknown locality in China where sequences were accessed from GenBank. Black solid line (Ithmus of Kra) and dashed lines (Kangar-Pattani Line) are the biota transition zones proposed in the peninsular. The arrows indicate the approximate localities of subspecific forms in the research area.