Examples of Fossil Jaws (IMAGE) University of Bristol Caption A sample of lower jaw diversity from 400 million years ago which includes from top to bottom: a giant 8-meter apex predator, a lungfish with a duck-like snout, a reef-dwelling representative of a totally extinct group of vertebrates, a fish-like relative of land animals, and a shark-like cousin of bony fishes. Jaws are not to scale and all are oriented so their front end is to the left. Credit Simon Powell Usage Restrictions Please note: the image is for single use only to illustrate this press release and is not to be archived. Please credit the copyright holder: Simon Powell 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.