Figure 2 in New data on the braincase of the aetosaurian archosaur (Reptilia: Diapsida) Stagonolepis robertsoni Agassiz

Figure 2. Stagonolepis robertsoni Agassiz. External view of left otic region of braincase of MCZD 2-4 in ventral (A) and posterolateroventral (B) views. Anterior is to the bottom of the figure. For scale see Fig. 1. bk = break in specimen; bpt = basipterygoid process; bs-pr = parabasisphenoid-prootic suture; btbo = basal tuber of basioccipital; btbs = basal tuber of parabasisphenoid; cpr = crista prootica; op = opisthotic; op-pr = opisthotic-prootic suture; uc = unossified channel/cleft; VII = foramen for facial nerve.