Discovered in the US state of Arizona and described from fossils found in the Moenkopi Formation

Las patas traseras eran largas y delgadas

approximately 225 million years ago

Helicoprion's body was similar to that of modern sharks

Sarcosuchus imperator Meiolania Discovered in the US stateSarcosuchus imperator was one of the largest known crocodyliformes of the Early Cretaceous, a semi aquatic predator of exceptional size that inhabited the river systems of North Africa, especially in deposits of the El Rhaz Formation in Niger, during the Aptian Albian stages, approximately 112 million years ago. Although often compared to modern crocodiles due to its general appearance, Sarcosuchus did not belong to the group of modern crocodiles, but