Primate Evolutionary Relationships (IMAGE) Johns Hopkins Medicine Caption This is a simplified diagram showing evolutionary relationships among primates. NW, new world; OW, old world. Credit Kenneth Rose, Johns Hopkins Medicine 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.