Fig. 13 in The early evolution of postcranial skeletal pneumaticity in sauropodomorph dinosaurs

Fig. 13. Vertebrae of the helmeted guinea fowl, Numida meleagris (Linnaeus, 1758), BP/4/1332 from Gauteng, South Africa, in anterior view. A. Last free cervical, C15. B. Last presacral thoracic, T4. Arrows point to the main pneumatic foramina of each vertebra. Note that the pneumatic foramina occur on the anteroventral surface of the transverse processes of both vertebrae despite being formed by diverticula from different sources. In A the diverticula extend from the cervical air sac system whereas in B the foramina result from the activity of diverticula from the abdominal air sacs.