An Abundance of Microscopic Yellow-Green "Balls" Rolling Through Water Collected from a Lake (video) Centre for Ecology & Hydrology Share Print E-Mail Loading video... Caption These are colonies of the algae Syncrypta/Synura, each one made up of many separate cells with whip-like tails (flagella) that are used for swimming. One of the datasets used in the paper. Credit Dr. Stephen Thackeray / Centre for Ecology & Hydrology Usage Restrictions None Share Print E-Mail 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.