paramecium (IMAGE) University of California - Santa Barbara Caption The single-celled Paramecium bursaria hosts a symbiotic green algae that enables it to photosynthesize. This opens up new lifestyles for the otherwise heterotrophic species. Credit ANATOLY MIKHALTSOV VIA WIKIMEDIA Usage Restrictions For Use with Credit 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.