Figure 1

Comparative profiles composed of inter- and intraspecific variations revealed in the first two axes of PCA based on the seven functional units. M: Male; F: Female. Three different profiles are found: 1) mandible, lower teeth and upper teeth in which interspecific variation is revealed along the first axis, intraspecific variation is, however, along the second axis; 2) lower and upper face whose structure is almost opposite to that illustrated in previous one, and 3) calvaria and cranium in which inter- and intraspecific variations are divided orthogonally by the two axes.