Definition: An order in the phylum Sarcomastigophora characterized by the presence of two flagella so placed as to cause the organism to have a whirling motility. Its outer surface is composed of cellulose-containing plates the size and number of which vary with genus and species. It includes many dinoflagellates that can produce toxins harmful to humans and other vertebrates.
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Examples: glitazone, GI cocktail, etc.