Toxic marine Dinoflagellate (Karenia brevis) that causes red tide. This gymnodinioid dinoflagellate has an equatorial groove containing one undulating flagellum and a second flagellum that trails behind the cell. They produce the brevetoxin which affects the central nervous system of fish, and people can become ill with neurotoxic shellfish poisoning when they eat shellfish that have accumulated brevetoxin. Humans can also experience respiratory irritation when a red tide algal bloom is present close to shore from the Carolinas to along the shores of the Gulf of Mexico. SEM X1065.
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