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The five patterns presented herein only apply to taxa in which the vidian nerve enters the carotid canal system (i.e., turtles with patterns IA, IIA, and IIB). Abbreviations: caj, cavum acustico-jugulare; ccv, canalis cavernosus; cnhd, canalis nervus hyomandibularis distalis; snh, sulcus nervus hyomandibularis; VIIhy, nervus hyomandibularis.
