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There are three main shapes of bacteria: bacillus, coccus, and spiral. Bacillus, or rod shaped bacteria, are one of the main forms, and are typically 0.5 micrometers to 1.0 micrometer in width, and from 1.0 micrometer to 4.0 micrometers in length. Examples of bacilli include Bacillus anthracis, the bacterium that causes anthrax, and the well known E. coli.
When observing bacteria with microscope, it is not difficult to compare bacterial cell shapes and arrangements. There are many bacterial morphologies, each of them with a specific name.1  Rod-shaped (Baccilus) i.e. Escherichia coli, Bacillus cereus.hen observing bacteria with microscope, it is not difficult to compare bacterial cell shapes and arrangements. There are many bacterial morphologies, each of them with a specific name. 1  Rod-shaped (Baccilus) i.e. Escherichia coli, Bacillus cereus.