Secodontosaurus willistoni Archelon como el cortejo y la

como el cortejo y la intimidación

Approximate measurements of the Yinlong:

approximately 155-145 million years ago

making them one of the largest known pterosaurs

supporting itself on its hind and front legs

Secodontosaurus willistoni Archelon como el cortejo y laSecodontosaurus 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