it reached a size of about 60 cm in length and would have had a long

provided it with an effective defense against marine predators of the time

about 97 to 94 million years ago

También se encontraron restos microscópicos de tejido blando y fibras de colágeno en la superficie de algunos dientes de Tyrannosaurus rex

and a relatively small head

Secodontosaurus willistoni Scutosaurus it reached a size ofSecodontosaurus willistoni, an extinct genus of synapsid, a group of mammal related animals that lived during the Permian period, approximately 275 million years ago. It was a member of a group known as therapsids, which were the predecessors of modern mammals. Secodontosaurus willistoni was a medium sized animal, with an estimated length of around 2. 7 meters. It had a large, elongated skull, with sharp, conical teeth that suggest it fed on small