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Vorticella campanula
The protozoon ''Vorticella campanula'' is found in freshwater ponds, lakes, rivers, and streams with aquatic vegetation. It has a global distribution. ''Vorticella campanula'' is solitary and not colonial but usually social, several of them being found together. ''Vorticella campanula'' is a sedentary (fixed) form. It is commonly attached by a long highly contractile stalk to some submerged objects like weeds, animals, or stones. ''Vorticella campanula'' is often found in large groups. All the individuals in the group, however, remain free and independent of each other. Most ''Vorticella'' are found in abundance in stagnant water rich in decaying organic matter and feed largely on bacteria, but ''Vorticella campanula'' live only in uncontaminated water where bacterial growth is poor.
==References==
*Parker, T. J and Haswell, W. A, (1965) A text book of Zoology, MacMilian & Co.Ltd.,London & New York.
*Taylor, W. T and Weber, R. J. (1961) General Biology Van Nostran, East West Publications, NY.
*Barnes, R. D., (1968) Invertebrate Zoology W.B.Saunders Co., Philadelphia London
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