What is the size of the largest bacteria?

Thiomargarita namibiensis is a gram-negative coccoid Proteobacterium, found in the ocean sediments of the continental shelf of Namibia. It is the largest bacterium ever discovered, as a rule 0.1–0.3 mm (100–300 μm) in diameter, but sometimes attaining 0.75 mm (750 μm).

Accordingly, what is the average size of a bacterium?

"Most bacteria range from 0.2–2.0 µm (micrometers) in diameter." "Less than 1 micron (0.001 mm/0.00004 inch) in length. Hundreds of thousands of bacteria can fit into a space the size of the period at the end of a sentence."

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