Dolphin (IMAGE) American Museum of Natural History Caption The Atlantic white-sided dolphin (Leucopleurus [Lagenorhynchus] acutus) is a close relative to the Cetacean. Credit Carl Buell Usage Restrictions None 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.