Pyrocystis pseudonoctiluca syn Pyrocystis noctiluca, Dissodinium pseudolunula
This cell is in the dominant vegetative state and is greater than 350µm in diameter when fully developed. The complicated life stages go from armored planospore to nonmotile cellwhich can be 200µm or less in diameter. It will produce one or two biflagellated armored cells that look like Alexandrium. Cell can also produce unarmored cells that are spheres that can grow into a larger size. See Tomas in Taxonomic References.