Illustration of a prehistoric shark (IMAGE)

University of Zurich

Illustration of a prehistoric shark

Caption

With mouths closed, the older, smaller teeth of the ancestors of today's sharks stood upright on the jaw, while the younger and larger teeth pointed towards the tongue and were thus invisible when the mouth was closed.

Credit

Illustration: Christian Klug, UZH

Usage Restrictions

With credit

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.