Drs. Jason Downs and Ted Daeschler, Academy of Natural Sciences (image) Academy of Natural Sciences of Drexel University Share Print E-Mail Caption Drs. Jason Downs and Dr. Ted Daeschler, both of the Academy of Natural Sciences, with the fossil skull of Laccognathus embryi, a large predatory fish that lived 375 million years ago. Credit C. Frederick Mullison/ANSP Usage Restrictions None Share Print E-Mail 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.