text-fig. 15. Occipital views of the skulls of a basal ornithischian (a) and two theropods (b-c), illustrating different character states for several cranial characters, a, basal ornithischian Lesothosaurus diagnostic^-, redrawn from Sereno (19916)- B, Herrerasaurus ischigualastensis; redrawn from Sereno and Novas (1993). c, Allosaurusfragilis (braincase only); based on BYU Mes 5583. Abbreviations: boc, basioccipital; bsp, basisphenoid; bt, basal tuber; eo, exoccipital; f, frontal; fm, foramen magnum; itf, infratemporal fenestra; oc, occipital condyle; pa, parietal; po, postorbital; pop, paroccipital process; pt, pterygoid; q, quadrate; qf, quadrate foramen; qj, quadratojugal; soc, supraoccipital; socw, supraoccipital wedge; sq, squamosal; vcd, foramen for the entrance of the vena capitis dorsalis. Dashed lines indicate the level of the dorsal margin of the occipital condyle (wide dash) and the level of the bases of the paroccipital processes (narrow dash). Scale bars represent 10 mm (a) and 50 mm (b-c). in The interrelationships and evolution of basal theropod dinosaurs

text-fig. 15. Occipital views of the skulls of a basal ornithischian (a) and two theropods (b-c), illustrating different character states for several cranial characters, a, basal ornithischian Lesothosaurus diagnostic^-, redrawn from Sereno (19916)- B, Herrerasaurus ischigualastensis; redrawn from Sereno and Novas (1993). c, Allosaurusfragilis (braincase only); based on BYU Mes 5583. Abbreviations: boc, basioccipital; bsp, basisphenoid; bt, basal tuber; eo, exoccipital; f, frontal; fm, foramen magnum; itf, infratemporal fenestra; oc, occipital condyle; pa, parietal; po, postorbital; pop, paroccipital process; pt, pterygoid; q, quadrate; qf, quadrate foramen; qj, quadratojugal; soc, supraoccipital; socw, supraoccipital wedge; sq, squamosal; vcd, foramen for the entrance of the vena capitis dorsalis. Dashed lines indicate the level of the dorsal margin of the occipital condyle (wide dash) and the level of the bases of the paroccipital processes (narrow dash). Scale bars represent 10 mm (a) and 50 mm (b-c).