Lackey, James B. Department of Environmental Engineering, University of Florida, Gainesville, Florida.
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An order of parasitic flagellate protozoa belonging to the class Zoomastigophorea. P. P. Grassé suggested that there should be eight orders of these parasitic (and symbiotic) zooflagellates, all in a superorder Metamonadina, but this may be an oversimplification. All retortamonads are medium to large in size and have a complicated blepharoplast-centrosome-axostyle apparatus. Members of the Retortamonadida have two or four flagella, one turned ventrally into a cytostomal depression. The nucleus, containing a distinct endosome, is located at the anterior tip. The body is twisted. These organisms are actually symbionts, ingesting bacteria in the digestive tracts of their hosts.
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