LM of Stentor coeruleus

LM of Stentor coeruleus

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Caption: Light micrograph of the trumpet-shaped freshwater ciliate Stentor coeruleus. Stentor is a free- living protozoan that may also attach itself to a substrate, such as a filament of algae, by means of a tapering foot. The broad lip of the bell- shaped mouth and the surface of the internal cavity (seen here) are covered with rows of compound cilia, which beat rapidly, drawing in & filtering a variety of microscopic food particles such as bacteria, diatoms & rotifers. Stentor is a contractile organism. When disturbed it shrinks down close to the substrate, later returning to an extended feeding position, as here. Magnification x125 at 35mm size.

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Keywords: animal, ciliate, contractile animal, invertebrate, invertebrates, light micrograph, nature, protozoa, protozoan, stentor coeruleus, wildlife, zoology

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