Xyelid (IMAGE) Pensoft Publishers Caption This is a fossil xyelid. This most archaic wasp family has changed little in the past 240 million years. Credit Dr. Dmitry Shcherbakov Usage Restrictions CC-BY 3.0 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.