Figure 16 in Ontogeny and variation of the pachycephalosaurine dinosaur Sphaerotholus buchholtzae, and its systematics within the genus

Figure 16. Potential morphologies to differentiate between Sphaerotholus buchholtzae and S. edmontonensis. Note the shorter anterior supraorbital (red) and longer postorbital length (blue) of S. buchholtzae – the opposite conditions in S. edmontonensis, the dorsoventrally taller posterior peripherial element contacts (orange) of S. buchholtzae to S. edmontonensis, and the more curved than straight dorsal margins of the anterior peripheral elements (yellow) of S. buchholtzae to S. edmontonensis. Sphaerotholus buchholtzae and S. edmontonensis are equal length in this image, but the actual specimens are not to scale.