incluyendo América del Norte

although some species may have been even larger

The combination of these factors may have had a significant impact on populations of large prey and predators

meaning it had characteristics of both sauropods and their more primitive ancestors

Dimetrodon limbatus Dryosaurus incluyendo América del NorteDimetrodon limbatus, extinct species of synapse reptile, belonging to the group known as pelycosaurs. They lived during the Permian period, approximately 295 to 272 million years ago. Despite often being mistaken for a dinosaur, Dimetrodon was not a dinosaur, but rather a distant relative that lived long before dinosaurs appeared. One of the most distinctive features of Dimetrodon limbatus is its dorsal sail, which was made up of tall structures of