Lackey, James B. Department of Environmental Engineering, University of Florida, Gainesville, Florida.
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An order of the class Zoomastigophorea, phylum Protozoa. These are small, colorless flagellates, some of which are free-living and some parasitic. The body of this protozoan is bilaterally symmetrical, composed of two mirror halves, each with a nucleus and a full set of organelles. There are four flagella to a side, not all of the same length. In division of the cell, the two nuclei each form a spindle, so that each daughter cell receives two nuclear complexes.
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