Pseudo-Nitzschia Diatom (IMAGE) University of California - San Diego Caption This is a microscopic view of domoic acid producing Pseudo-nitzschia diatom in a seawater sample from Monterey Bay, Calif. This diatom species, when in active growth typically typically forms long chains of individual cells. Credit G. Jason Smith at Moss Landing Marine Labs. 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.