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 suspensorium rendered in red. Isolated suspensorium in C) left lateral view and D) rendered transparent. Suspensorium in E) medial aspect and F) rendered transparent. ar, articular; ARd, articular diverticulum; cty, crista tympanicum; fa, foramen aerum; IFd, infundibular diverticulum; poIFd, postinfundibular recess; prIFd, preinfundibular recess; ptso
ifd, communicating ostium between pharyngotympanic sinus and infundibular diverticulum; ptso
qd, communicating ostium between pharyngotympanic sinus and quadrate diverticulum; ptso
st, communicating ostium infundibular diverticulum and the subtympanic portion of the pharyngotympanic sinus; qbs, = basisphenoidal suture of quadrate; q, quadrate; Qd, quadrate diverticulum.