 In 2012 a third " stem aetosaur " was described from the Middle Triassic Manda Beds of Tanzania . It differs from other Middle Triassic pseudosuchians in having a long skull , a small antorbital fenestra that fits into a large antorbital fossa in front of the eye socket , sharp and curved teeth , and osteoderms covering much of its body . Like aetosaurs and Revueltosaurus , it has a maxilla that fits into the jugal . Revueltosaurus , Turfanosuchus , and the unnamed Tanzanian pseudosuchian are all good fits for the hypothesized ancestor of aetosaurs because they both have double rows of leaf @-@ shaped osteoderms along their backs that could potentially have evolved into the tightly fitting paramedian osteoderms of aetosaurs . 
