Fig 9.

Perinatal Alligator mississippiensis (OUVC 10606) shown in A) left lateral view with the braincase rendered in red and B) with the braincase isolated and the prootic rendered in red. Left lateral view of C) the isolated prootic, D) rendered transparent with endosseous labyrinth and G) with associated cranial nerves. Left prootic in E) medial aspect and F) rendered transparent with endosseous labyrinth. Labyrinth is rendered in pink, and the prootic diverticulum rendered in teal. cssc, caudal semicircular canal; lag, lagena; lssc, lateral semicircular canal; PRd, prootic diverticulum; PTsf, fossa for pharyngotympanic sinus; ptso _pr, communicating ostium between pharyngotympanic sinus and prootic diverticulum; rssc, rostral semicircular canal; V _gang, trigeminal ganglion; V _tymp, tympanic ramus of trigeminal nerve; V ₁, ophthalmic ramus of trigeminal nerve; VII, facial nerve.