Fig. 16 in A Small Derived Theropod from Öösh, Early Cretaceous, Baykhangor Mongolia

Fig. 16. Systematic variation in splenial morphology among theropod dinosaurs. Citipati osmolskae (IGM 100/978), top, illustrating a splenial that does not form a notched anterior margin of the internal mandibular fenestra (character 250.0). Tyrannosaurus rex (FMNH PR2081), bottom, illustrating a splenial that forms a notch anterior margin to the internal mandibular fenestra (character 250.1). Images not to scale.