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Unformatted text preview: radiating channels. Other ciliates. There are many other species of ciliate. Vorticella has a stalk which can retract if the protozoan is disturbed. The cilia do not cover the body but are restricted to a double row on the upper margin. The cilia create a feeding current which wafts food particles into the oral groove. vacuole filling vacuole full and about to empty Photomicrograph of a stalked ciliate used in sewage treatment plants where they ingest bacteria. A. Pasking D.G. Mackean circle of cilia which create a water current, sweeping food particles into the oral groove oral groove nucleus contractile vacuole food vacuole contractile stalk pond weed Vorticella...
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- Fall '11