Type specimen of Paratingia wuhaia (IMAGE) Proceedings of the National Academy of Sciences Caption Type specimen of Paratingia wuhaia, a 298 million-year-old tree revealing an ancient seed plant sister group. Image credit Jun Wang Credit Image credit: Jun Wang 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.