Figure 5. Cranial morphology. Comparative crania of C. lomamiensis (left) and C. hamlyni (right) (A), and principal components analysis of
Procrustes aligned coordinates in a 3-D geometric morphometric analysis of 23 landmarks on cercopithecin crania (B). The wireframe crania at each
end of PC1 and PC2 represent the shape changes observed moving across a given axis. Distinctive changes in cranial shape separating the taxa on
PC1 are associated with orbit size and occipital length/flexion. The minimum convex polygon representing C. lomamiensis (n = 3) does not overlap
with the minimum convex polygon representing its sister species, C. hamlyni (n = 7). See Table S4 for details of statistical results.
doi:10.1371/journal.pone.0044271.g005