Achromatium oxaliferum, the largest freshwater bacterium
(colored interference contrast micrograph).
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Cells of the largest freshwater bacterium, Achromatium oxaliferum, have a diameter of up to 0.1 mm. The cells look like shiny eggs, when observed in front of a dark background under a binocular microscope. This bacterium can be found in the upper sediment layers of lakes.
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Giant sulfur bacteria
