BACILUS SHAPE

Bacillus (shape)

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Bacteria display a large diversity of cell morphologies and arrangements.

A bacillus (plural bacilli) is a rod-shaped bacterium. Bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of bacteria. The name Bacilli, capitalized but not italicized, can also refer to a less specific taxonomic group of bacteria that includes two orders, one of which contains the genus Bacillus.
Bacilli are usually solitary, but can combine to form diplobacilli, streptobacilli, and palisades.^[1]
There is no connection between the shape of a bacterium and its colors in the Gram staining. MacConkey agar can be used to distinguish among Gram negative bacilli such as E. coli and salmonella.^[2]

Examples of Gram positive bacilli

• Clostridium genus
• Corynebacterium genus
• Listeria genus
• Propionibacterium genus

Examples of Gram negative bacilli

• Salmonella species
• Escherichia species
• Pseudomonas species
• Bacteroides species

References

1. CHAPTER 4 FUNCTIONAL ANATOMY OF PROKARYOTIC AND EUKARYOTIC CELLS.^{[dead link]}
2. "Gram Negative Bacilli".^{[dead link]}

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