Eoviscaccia frassinettii Jaw (image) American Museum of Natural History Caption This photo shows the fossilized jaw of the oldest chinchillid rodent, Eoviscaccia frassinettii, which is related to the modern chinchilla. Credit AMNH/M. Ellison Usage Restrictions Credit required 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.