Skull face colored (IMAGE) University of Texas at Austin Caption Separate sections of the skull of a Zygaspis quadrifron specimen are highlighted in this CT scan. The large nasal cavities and prominent central tooth stand out in this photo. Credit Scans courtesy of the Jackson School of Geosciences CT lab, coloring and rendering by Sam Houston State University Usage Restrictions Please credit image License Original 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.