1.   Based on its skeletal features, hadrocodium is the closest relative of the time to modern mammals, the researchers said.

2.   Inspired by the success of his experiments with modern mammals, Hillenius decided to do a systematic search for turbinal ridges in the fossil skulls of mammallike reptiles.

3.   It may have been an ancestor of all modern mammals.

4.   They had discovered fossils of what they called mammallike reptiles, which had some similarities to modern mammals but were clearly primitive.

5.   Luo said Hadrocodium is a distant and extinct relative of modern mammals.