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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.
Dinoflagellates also produce some of the bioluminescence sometimes seen in the sea. Under certain conditions, several species can reproduce rapidly to form water blooms or red tides that discolour the water and may poison fish and other animals. Some dinoflagellates produce toxins that are among the most poisonous known. Red tide off the coast of La Jolla, Calif. Red tides are caused by toxic dinoflagellate blooms. p.