Figure 9 in Ontogeny and variation of the pachycephalosaurine dinosaur Sphaerotholus buchholtzae, and its systematics within the genus

Figure 9. Two-dimensional geometric morphometric principal component analysis of examined pachycephalosaurines in dorsal view. Red square = Sphaerotholus edmontonenesis; green star = S. goodwini; blue circle = S. buchholtzae; yellow triangle = Foraminacephale brevis. Blue polygonal space is the enveloping morphospace occupied by S. buchholtzae. Large yellow polygonal space is the enveloping morphospace occupied by Foraminacephale brevis. Specimens not to scale.