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Left rostra of (A) Sinraptor dongi (figure modified from [16]) and (B) Acrocanthosaurus atokensis (NCSM 14345). aof, antorbital fenestra; en, external naris; mf, maxillary fenestra; nf, narial fossa; nmp, naso-maxillary process; nr, nasal recesses; pmf, promaxillary fenestra.
