Fig. 3 in The early evolution of postcranial skeletal pneumaticity in sauropodomorph dinosaurs

Fig. 3. Selected vertebrae of basal sauropodomorphs showing the three primary infradiapophyseal fossae (shaded grey) and their bounding laminae (not to scale). A. Plateosaurus engelhardti Meyer, 1837; C9, the posterior cervical vertebra. B. Plateosaurus engelhardti Meyer, 1837; D2, the anterior dorsal vertebra. Note that in this vertebra the central position of the parapophysis precludes the presence of a paradiapophyseal lamina and so the AIDF and MIDF are separated by an anterior centroparapophyseal lamina. C. Aardonyx celestae Yates, Bonnan, Neveling, Chinsamy, and Blackbeard, 2010, a middle posterior dorsal vertebra. Note that in this vertebra the prezygodiapophyseal lamina and the AIDF are absent. A, B redrawn from Bonaparte (1999).