Cetotherium riabinini (IMAGE) Universiteit Utrecht Faculteit Geowetenschappen Caption Cetotherium riabinini – the smallest whale ever found in fossil records. Credit Utrecht University Usage Restrictions N/A License Original 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.