Classification: Synapsida, Pelycosauria, Sphenacodontidae
Body length: 3 m
Body weight: 250 kg
Period: Early Permian
Location: USA, Germany
Dimetrodon is often mistaken as a dinosaur or as a contemporary of dinosaurs, but it went extinct around 40 million years before the appearance of the first dinosaur in the Triassic period.Dimetrodon was a carnivore living in swampy areas, with a huge head and mouth, large, powerful jaws, and two types of teeth - sharp canines and shearing teeth. It probably ate other pelycosaurs (its close relatives), insects, and other animals. It could leave its cold, sluggish state much earlier after sunrise than the pelycosaurs with no sails and catch and eat them.