sentences:  As a typical archosaur, "Batrachotomus" had two antorbital fenestrae between the orbits and nostrils, and a fifth pair of small openings at the rear part of the lower jaw.The jaws contained sharp teeth which were compressed laterally and unequal in size and shape, and this variation of tooth shape is known as heterodonty.The teeth on the premaxillae (bones at the very tip of the upper jaw) were slender, unlike those of the maxillae (the main tooth-bearing bones in the upper jaw) which had a straight posterior edge.