Fig. 8 in The early evolution of postcranial skeletal pneumaticity in sauropodomorph dinosaurs

Fig. 8. Sacral elements of the basal sauropodomorph Aardonyx celestae Yates, Bonnan, Neveling, Chinsamy, and Blackbeard, 2010, from the Lower Jurassic Elliot Formation of Spion Kop, South Africa. A. Incomplete neural arch of first sacral vertebra, BP/1/5379 in left lateral (A1) and posterior (A2) views. Close−up of left posterior fossa in posteroventral view (A3). Note the subfossae separated by a ridge (arrowed). B. First sacral centrum, BP/1/6241 in left lateral (B1) and oblique posterolateral and slightly ventral (B2) views. Close−up of the dorsolateral fossa (B3) developed behind the sutural scar for the attachment of the sacral rib.