Commonly found in coastal and estuarine waters. It forms extensive red tides in many parts of the world, but is usually considered harmless.
Upper Newport Bay, Newport Beach, Orange County, CA. 3/16/13. © Joana Tavares and Peter J. Bryant.
Phylum Dinoflagellata; Class: Dinophyceae; Order: Prorocentrales; Family: Prorocentraceae