Fig. 1 in The early evolution of postcranial skeletal pneumaticity in sauropodomorph dinosaurs

Fig. 1. The pneumaticity profile of O'Connor (2006: fig. 12). The osteological correlate with the lowest specificity is at the bottom of the profile, while the correlate that specifies only pneumatic diverticula is at the top. The profile has been modified to indicate that pneumatic diverticula can form simple vertebral fossae.