Fossilized Teeth and Upper Jaw of Megapiranha paranensis (image) National Evolutionary Synthesis Center (NESCent) Share Print E-Mail Caption This photograph of the fossilized teeth and upper jaw of Megapiranha paranensis shows intermediate tooth arrangement between single-rowed piranhas and their double-rowed relatives. The fossil measures about 3 inches in length. Credit Photo courtesy of Mark Sabaj-Pérez 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.