Part of a Lophosteus jawbone (IMAGE) eLife Caption Part of a jawbone of the 422-million-year-old fossil bony fish Lophosteus, visualised with a high-resolution X-ray technique. On the right, the surface of the jawbone is shown in grey. In the middle, exposed teeth are highlighted in gold and dermal odontodes in shades of purple, pink and red. On the left, the bone itself is made transparent, revealing internal blood vessels and pulp cavities, shown in blue and green, as well as the embedded teeth and dermal odontodes. Credit Chen et al. (CC BY 4.0) Usage Restrictions This image is free to be reused, as long as it is credited appropriately 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.