The species Carchesium on an activated sludge particle
of the sewage
plant of Oldenburg. The cells without appendix are about
50 µm in length.
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Vorticella
Members of genus Vorticella represent one of the most impressive group within the Protozoa. They occur in nature as single organisms as well as in colonies looking like a bunch of flowers. They are ubiquitary in freshwater and seawater habitats where their favorite food, bacteria, occur in high concentrations. The micrograph shows an activated sludge sample of a sewage plant. Vorticella has cleared the water from small free-living bacteria while filamentous bacteria are too big to be get sucked in.
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Vorticella
