Aetosaurus

Aetosaurus is an extinct genus of archosaur reptile belonging to the order Aetosauria. It is generally considered to be the most primitive aetosaur.

Aetosaurus was a small, primitive aetosaur. Unlike more derived aetosaurs such as Desmatosuchus or Typothorax, the carapace was long and narrow and lacked spikes.

Jurassic Park
Aetosaurus has never appeared or mentioned in any Jurassic Park films or books, it has however appeared in the Dinosaur Field Guide as well as the Jurassic World Dinosaur Field Guide.