Tongtianlong Skeleton (IMAGE) University of Edinburgh Caption A well preserved fossil of a new species of winged dinosaur, known as Tongtianlong or Mud Dragon, is giving scientists vital clues on a late flurry of evolution before the mass exctinction event. Credit Junchang Lu Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.