text-fig. 18. Skulls of a basal ornithischian (a) and three theropods (b-d) in palatal view, showing different states for several cranial characters. A, Lesothosaurus diagnostics; redrawn from Sereno (199lb). B, Allosaurus fragilis', redrawn from Madsen (1976). c, Daspletosaurus torosus; redrawn from Russell (1970). D, Oviraptor philoceratops; redrawn from Barsbold et al. (1990). Abbreviations: bsp, basisphenoid; bspr, basisphenoid recess; ch, internal choana; cp, cultriform process of the parasphenoid; ect, ectopterygoid; iptv, interpterygoid vacuity; j, jugal; m, maxilla; oc, occipital condyle; pal, palatine; pm, premaxilla; pop, paroccipital process; pt, pterygoid; q, quadrate; qj, quadratojugal; sof, suborbital fenestra; spf, subsidiary palatal fenestra; snf, subnarial foramen; stf, subtemporal fenestra; v, vomer. Scale bars represent 10 mm (a), 50 mm (d) and 100 mm (b-c). in The interrelationships and evolution of basal theropod dinosaurs

text-fig. 18. Skulls of a basal ornithischian (a) and three theropods (b-d) in palatal view, showing different states for several cranial characters. A, Lesothosaurus diagnostics; redrawn from Sereno (199lb). B, Allosaurus fragilis', redrawn from Madsen (1976). c, Daspletosaurus torosus; redrawn from Russell (1970). D, Oviraptor philoceratops; redrawn from Barsbold et al. (1990). Abbreviations: bsp, basisphenoid; bspr, basisphenoid recess; ch, internal choana; cp, cultriform process of the parasphenoid; ect, ectopterygoid; iptv, interpterygoid vacuity; j, jugal; m, maxilla; oc, occipital condyle; pal, palatine; pm, premaxilla; pop, paroccipital process; pt, pterygoid; q, quadrate; qj, quadratojugal; sof, suborbital fenestra; spf, subsidiary palatal fenestra; snf, subnarial foramen; stf, subtemporal fenestra; v, vomer. Scale bars represent 10 mm (a), 50 mm (d) and 100 mm (b-c).