Fig. 15 in New skulls of the basal sauropodomorph Plateosaurus trossingensis from Frick, Switzerland: Is there more than one species?

Fig. 15. Overview over the distribution of variable features occurring in two or more skulls (category II and III characters; CII and CIII, respectively) in the 18 most complete skulls of Plateosaurus examined herein. The prevalent character state is marked with "a", while the rarer state is marked with "b". Intermediate states are marked with "c". No correlations of feature combinations that might indicate distinct species are evident, and the observed pattern is consistent with intraspecific variability.