with gastralia, dermal bones located in the ventral region of the body. Skull The skull of Postosuchus was constructed narrow in front and extended wide and deep behind. It was 55 cm in length and 21 cm broad and deep. There are many fenestrae (openings) present in the bones that lighten the skull, providing space for the muscles. Like more derived archosaurs, the lower jaw had mandibular fenestrae (openings at the lower jaw), formed by the junction of the dentary with other jaw bones (surangular and angular). Postosuchus had very good long distant sight, due to large orbits, supporting large and sharp eyes, and strong olfaction provided by elongated nostrils. Inside the skull, under the nostrils, there was a hollow that may have contained the Jacobson's organ, an olfactory sensory organ sometimes referred as the "sixth sense". The jaws held large and sharp serrated teeth, of which some were developed even larger to operate as hooked sabers. A complete tooth found among Postosuchus remains in North Carolina measured about 7.2 cm in height. Postosuchus possessed heterodonty dentition, which means each tooth was different in size and shape from the others. The upper jaw contained seventeen teeth, with each premaxilla bearing only four teeth and each maxilla thirteen teeth. In the lower jaw were over thirty teeth. Replacement activity in Postosuchus was different from that of crocodiles, since the replacement tooth didn't fit directly in the pulp cavity of the old tooth, but grew until resorption of the old tooth was complete. Limbs and posture With the forelimbs being approximately 64% of the hindlimbs, Postosuchus had small hands bearing five toes. Only the first toe bore a large claw, which was used as an offensive weapon, and the forelimbs were robust, probably to hold the prey. The feet were much larger than the hands, with the fifth metatarsal forming a hook shape. The halluxes were slenderer than the other toes and the marginal ones could not touch the ground. Being a crurotarsan, the heel and ankle of Postosuchus resemble those of modern crocodiles. The limbs were located underneath the body giving Postosuchus an upright stance. Historically, there has been debate over whether or not rauisuchids like Postosuchus were mainly bipedal or quadrupedal. Each one of Postosuchus'''s two forelimbs was slightly over half the size of the hindlimbs. This characteristic of short forelimbs can usually be seen in bipedal reptiles. Chatterjee suggested