 The lower jaw as a whole is laterally compressed and curved anteroposteriorly, so that the narrow ventral surface is convex and the jaw forms a half-moon shape.The mandibular fenestra is elliptical, and does not excavate the dentary noticeably, rather remaining between angular and surangular.The dorsal end of the dentary extends posteriorly around part of the surangular; the outer surface of the dentary is entirely smooth.