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The smallest bacteria is “ Mycoplasma” and the largest bacteria is “ Thiomargarita namibiensis ".
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Mycoplasma is the smallest cell and the smallest bacteria living on earth having a size of about 0.2 micro meter

Thiomargarita namibiensis  biggest bacteria ever discovered ranging in size from 0.1 – 0.3 mm ( 100 – 300 micro meter ), but sometimes also has size of 0.75 mm or 750 micrometer.

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Mycoplasma is the smallest bacteria and Thiomargarita namibiensis is the largest bacteria .
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