 The skull of "Proterosuchus" exhibits many features characteristic of its position as a basal archosauriform.It bears a prominent antorbital fenestra, like most archosauriforms.In some specimens, the jugal and quadratojugal contact to complete the ventral margin of the lower temporal fenestra, as in other archosauriforms, but in other specimens, there is a narrow gap between the bones so that the lower temporal bar is incomplete as in non-archosauriform archosauromorphs.