Paleoillustration: "An artist’s rendering of the hypothetical placental ancestor, a small insect-eating animal. The research team reconstructed the anatomy of the animal by mapping traits onto the evolutionary tree most strongly supported by the combined phenomic and genomic data and comparing the features in placental mammals with those seen in their closest relatives.” Illustration by Carl Buell
Edaphosaurus was a genus of sail-back synapsid, a group of animals that includes mammals and their relatives. It lived from the late Carboniferous to the early Permian. Even though Edaphosaurus resembled a dinosaur, they were not dinosaurs. They are actually ancestors of early mammals.