MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Shelled amoeba. Rheinberg illuminated light micrograph of a Difflugia sp. testate (shelled) amoeba. Amoeba are freshwater single-celled organism that feed on bacteria and smaller protozoa. Testate amoeba have circular shells formed from the polysaccharide chitin. Magnification: x400 when printed at 10 centimetres wide.
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