FIGURE 33 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)

FIGURE 33. Photograph of the posterior portion of the dorsal surface of the skull of OMNH 58340, showing the small waist of the parietal (indicated by arrow). This groove may have been for the passage of an artery or may mark the separation between two muscles. There is an identical feature on the opposite side of the skull. Anterior is to the left.