Smilosuchus gregorii is a prehistoric, large predatory phytosaur that thrived during the Late Triassic period. It possessed a long, crocodile-like snout filled with sharp teeth, ideal for catching fish. This species was an apex predator in its riverine habitat, showcasing a thick, armored body for protection.

Smilosuchus gregorii is an extinct species of phytosaur that lived during the Late Triassic period. Fossil evidence indicates that its native region was primarily in what is now the southwestern United States, particularly in areas that are part of the Chinle Formation. This includes regions in present-day Arizona, New Mexico, and Texas.

During the Late Triassic, the environment that Smilosuchus gregorii inhabited was characterized by a warm and semi-arid climate. The region consisted of river systems and floodplains, with seasonal variations that included wet and dry periods. These conditions supported a diverse ecosystem with a variety of plant and animal life.

Smilosuchus gregorii was a large semi-aquatic predator, occupying a niche similar to that of modern crocodiles. It likely inhabited river banks and wetlands, preying on fish and other aquatic animals. Its adaptations included a long snout and robust teeth suited for catching and consuming prey in its aquatic environment.