Principal Component Analysis and linear regression between shape and size performed on skulls.

<p>A, relationship between PC1 and PC2. B, morphological changes in skull shape associated with size. Points dimensions are proportional to specimen Centroid Size. The continuous line represents <i>Torosaurus latus</i> morphospace. The dotted line represents <i>Triceratops prorsus</i> morphospace, and the dashed line represents <i>Triceratops horridus</i> morphospace.