Fig. S2 from Differential influences of allometry, phylogeny and environment on the rostral shape diversity of extinct South American notoungulates

(a) and (b) Principal component analyses for crania of notoungulates and associated virtual deformations with vectors (indicating the main areas of deformations) or landmarks on the extreme sides of each axis. Yellow and violet code for increases and decreases in surface area, respectively. For abbreviations see figure 1, and * characterizes Paleogene forms.