Fig. 3

Hierarchical clustering (above) and respective anatomical units (below) resulting from Euclidean distance covariance matrices. O. afer presented six clusters (A) while M. tridactyla presented four clusters (B). In both species, a naso-palatine cluster was detected (black arrow). Colors do not correspond to a specific anatomical region and differ from those used throughout the rest of this paper. “L” and “R” represent bilaterally symmetric anatomical clusters