the skull of "endothiodon" is most quickly recognized by the prominent upturned beak. the premaxilla and palate of the upper jaw are vaulted and allows for the upturned and pointed lower jaw to fit into this region. on the lower jaw, lateral to the teeth, is a broad groove. "endothiodon" lacks a lateral dentary shelf but has a bulbous swelling of the dentary. the function of this swelling is not yet known. the pineal foramen is situated on a boss, which is high in three of the species and low in one of them ("e. mahalanobsi"). there is also a boss situated on the ventral margin of the jugal. the anteroventral process is an anteroposteriorly short triangular bone, while in most other dicynodonts it is long and pointed.