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In page Flagellate:

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Flagella are generally used for propulsion. They may also be used to create a current that brings in food. In most such organisms, one or more flagella are located at or near the anterior of the cell (e.g., Euglena). Often there is one directed forwards and one trailing behind. Many parasites that affect human health or economy are flagellates in at least one stage of life cycle, such as Naegleria, Trichomonas and Plasmodium.[3][4] Flagellates are the major consumers of primary and secondary production in aquatic ecosystems - consuming bacteria and other protists.[citation needed]