Protosuchus

Protosuchus (from protos, "first" and souchos, "crocodile") is an extinct genus of carnivorous crocodyliform from the Early Jurassic. It is among the earliest animals that resemble crocodilians. Protosuchus was about 1 m in length and about 40 kg in weigh As an early crocodilian relative, its skull featured more crocodilian characteristics than its earlier ancestors; it had short jaws that broadened out at the base of the skull, providing a large surface to which its jaw muscles could attach. This increased the maximum gape of the animal's mouth and the force with which the jaws could be closed. The dentition of the animal also resembled modern crocodiles, including the teeth in the lower jaw that fitted into notches on either side of the upper jaw when the mouth was closed. It also possessed a powerful tail which later developed into a propulsion mechanism through water in its descendants.

The body was covered and reinforced by osteoderms in a double row along the back and covering the bottom of the body and the entire tail. It was an unusual quadrupedal reptile whose legs were columnar, with the rear legs longer than the front legs. Its five toes were clawed and it is believed that they were good runners and good swimmers.

Species
Three species of Protosuchus have been described: the type species P. richardsoni from Arizona, United States, P. micmac from Nova Scotia, Canada and P. haughtoni from South Africa.