Electron-microscope Picture (IMAGE) Penn State Caption The parasite that causes metabolic disorders in dragonflies, as it appears under an electron microscope at 100-micron scale. Known as "gregarines," the parasite belongs to Apicomplexa, a group of microorganisms including protozoa that cause diseases like malaria and cryptosporidiosis. Credit None 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.