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4.2 Cell size - Some Very Large Prokaryotes

The single giant rod-shaped bacterium, Epulopiscium fishelsoni, a symbiont of surgeon fish (0.6mm x 75µm) is shown alongside four Paramecium (phylum Firmicutes)

The giant ovoid-shaped bacterium (400µm = 0.4mm), Thiomargarita namibiensis, is a sulfur chemolithotrophic bacterium (phylum Proteobacteria)