Fig. 3.
Procrustes shapes for the salmon (dark) and trout (light) averages. A. dentary B. angular articular. In A and B each pair is in Procrustes alignment, such that the comparisons show shape deformations, not differences in orientations or sizes. The double headed arrows clarify the concordances in the shape changes: anterior regions (to the left) of both bones elongate for the salmon (darker arrows) and shrink for the trout (lighter arrows). Posterior regions (to the right) show the opposite shape changes. C. The bones are taken out of Procrustes alignment and presented as they approximately would fit together in both salmon and trout. For the salmon the size of the angular articular is reduced by 1/6th.