Cymbomonas (image) American Museum of Natural History Caption The green alga used in this study and shown here is from the genus Cymbomonas, which presumably resembles early ancestors of the group. The scale bar represents 10 micrometers. Credit AMNH/E. Kim Usage Restrictions Can be used with appropriate credit 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.