freshwater protozoa microorganism vorticella campanula by microscope. benthic water life

aquatic bacteria bell benthic benthos biology campanula ciliata ciliophora contractile education filtration flagella flagellum form freshwater lake life macro microbiology microorganism microscope nature plankton pond protozoa research river science sedentary shape stalk stream supermacro underwater vegetation vorticella water wildlife zoology zooplankton