http://en.wikipedia.org/wiki/Bacteria
Bacteria display a wide diversity of shapes and sizes, called morphologies. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. However, a few species — for example, Thiomargarita namibiensis and Epulopiscium fishelsoni — are up to half a millimetre long and are visible to the unaided eye;E. fishelsoni reaches 0.7 mm.Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometres, as small as the largest viruses.Some bacteria may be even smaller, but these ultramicrobacteria are not well-studied.
Bacteria display a wide diversity of shapes and sizes, called morphologies. Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length. However, a few species — for example, Thiomargarita namibiensis and Epulopiscium fishelsoni — are up to half a millimetre long and are visible to the unaided eye;E. fishelsoni reaches 0.7 mm.Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometres, as small as the largest viruses.Some bacteria may be even smaller, but these ultramicrobacteria are not well-studied.
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