Morphological distribution of
from mainland Southeast Asia. Circle represents morphological form from Thai-Malay Peninsula; solid square and crossed square represent morphological variation of form C; dot square represents morphological form A whereas asterisk represents the un-described form B (R. cf. affinis). The defined forms (A, B, C) are corresponded to Figure 10. Gray 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.