Onchopristis numidus Nothosaurus Triceratops (T

Triceratops (T

retaining ancient features that would have been common in early thyreophorans

Proterosuchus fergusi es considerado uno de los arcosauriformes más basales

Scale  1:35 - 57mm

suggesting an evolution toward more active and mobile forms

Onchopristis numidus Nothosaurus Triceratops (TOnchopristis numidus was a cartilaginous fish that lived during the Cretaceous Period , about 100 million years ago, in the rivers and deltas that today correspond to North Africa and other regions of the ancient supercontinent Gondwana. At first glance, it would have resembled today's sawfish , with an elongated body and a "saw" shaped snout that made it unmistakable. That snout, technically called a rostrum , was covered in a row of large, needle