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Left dentaries of (A) Allosaurus fragilis (UUVP 871), (B) Sinraptor dongi (image modified from [16]), and (C) Acrocanthosaurus atokensis (NCSM 14345) in lateral view. a, angular contact; emf, external mandibular fenestra; lsd, lateral sulcus of the dentary; sa, surangular contact.
