Secodontosaurus willistoni Archelon making them one of the

making them one of the largest known pterosaurs

Archelon's limbs were also remarkable

supporting itself on its hind and front legs

La Pose del Modelo representa un ejemplar de Velociraptor corriendo en persecución de una de sus presas

Secodontosaurus willistoni Archelon making them one of theSecodontosaurus 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