approximately between 155 and 150 million years ago

Como otros ceratopsianos

meaning it had a large

The habitat of Triceratops horridus extended across the subtropical plains and open woodlands of present-day Montana

Synthetoceras tricornatus Escala:1:35 approximately between 155 and 150Synthetoceras 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