 The shape of the animal's skull does support the suggestion that snakes were burrowers during their ancestry; it is clear that "Dinilysia" was terrestrial.The "Dinilysia patagonica" is a stem snake that is very closely related to the original ancestor of the clade of crown snakes.Once the fossil of the snake was discovered, an x-ray computed tomography was used to build a digitized endocast of its inner ear.