Diatoms (IMAGE) University of California - San Diego Caption A composition image of diatoms, single-celled algae famous for their ornamental cell walls made of silica. Credit Daniel Yee Usage Restrictions Must credit Daniel Yee License Original 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.