although more slender and agile than later spinosaurids such as Spinosaurus aegyptiacus

meaning it had a large

approximately between 155 and 150 million years ago

Being a stegosaurus

Synthetoceras tricornatus Escala:1:35 although more slender and agileSynthetoceras tricornatus was an extinct artiodactyl mammal belonging to Protoceratidae, an exclusively North American family of ungulates that has no living representatives. It lived during the Late Miocene of North America and is particularly well represented in Clarendonian faunas from the southern United States, with important records from Texas and other regions of the Great Plains. Although its general appearance may superficially resemble that