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diÂ·noÂ·flagÂ·elÂ·late. A plantlike flagellate of the subclass Phytomastigophorea, some species of which (for example, Karenia brevis) produce a potent neurotoxin that may cause severe food intoxication following ingestion of parasitized shellfish.
During periods of environmental stress, dinoflagellates form cysts. The most common dinoflagellate fossils are those in cyst form. However, some of the species have cyst cell walls made of cellulose, which does not fossilize. Those that do fossilize typically have walls made of a material similar to sporopollenin.