Cocci are spherical-shaped bacteria Staphylococcus aureus which cause skin infections are a typical example of cocci.Spirilli are spiral-shaped bacteria Helicobacter pylori which cause gastric ulcers are a typical example of spirilli.Bacilli are rod-shaped bacteria Escherichia coli which cause diarrhea are a typical example of bacilli.Prokaryotes fall into three basic categories based on their shape, visualized here using scanning electron microscopy: (a) cocci, or spherical (in a pair) (b) bacilli, or rod-shaped and (c) spirilli, or spiral-shaped. Finally, spiral-shaped bacteria, known as spirilli, include such species as Helicobacter pylori, which causes gastric ulcers.Ĭocci, bacilli, and spirilli. Rod-shaped bacteria, like Escherichia coli, are known as bacilli. Most bacteria exist in one of three shapes, spherical bacteria, known as cocci, include common pathogens such as Staphylococcus aureus causing skin infections. More examples of bacillus bacteria include Bacillus anthracis, which cause anthrax and Bacillus cereus, which commonly cause food poisoning.Bacilli (rod-shaped), spirilli (spiral-shaped), and cocci (spherical-shaped) are the major classifications of bacteria by shape.Ĭlassification of bacteria by shape provides scientists and pathologists with a common language to talk about the bacteria, as well as a way to identify different species of bacteria. Other strains, however, are pathogenic and can cause intestinal disease, urinary tract infections, and meningitis. coli that reside within us are harmless and even provide beneficial functions, such as food digestion, nutrient absorption, and the production of vitamin K. coli) bacteria are bacillus shaped bacteria. Coccobacillus: cells are short with a slight oval shape, resembling both coccus and bacillus bacteria.Įscherichia coli ( E.Palisades: cells in a chain are arranged side-by-side instead of end-to-end and are partially attached.Streptobacilli: cells remain in chains after dividing.Diplobacilli: cells remain in pairs after dividing.Monobacillus: remains single rod-shaped cell after dividing.These cells can exist in several different arrangements that include: Bacillus (bacilli plural) bacteria have rod-shaped cells. PASIEKA/Science Photo Library/Getty Images Bacillus Cell Arrangementsīacillus is one of the three primary shapes of bacteria. They are examples of bacilli shaped bacteria. coli bacteria are a normal part of the intestinal flora in humans and other animals, where they aid digestion. Other examples of coccus bacteria include Streptococcus pyogenes and Staphylococcus epidermidis.Į. A bacillus ( PL bacilli), also called a bacilliform bacterium or often just a rod is a rod-shaped bacterium or archaeon. These bacteria have become resistant to certain antibiotics and can cause serious infections that may result in death. While some strains are harmless, others such as methicillin-resistant Staphylococcus aureus (MRSA), can cause serious health issues. These bacteria are found on our skin and in our respiratory tract. Staphylococcus aureus bacteria are cocci shaped bacteria. Staphylococci: cells remain in clusters and divide in multiple planes.Sarcinae: cells remain in groups of eight and divide in three planes. Tetrad: cells remain in groups of four and divide in two planes.Streptococci: cells remain in chains after dividing.Diplococci: cells remain in pairs after dividing.Coccus (cocci plural) bacteria are round, oval, or spherical in shape. National Institutes of Health/Stocktrek Images/Getty Images Cocci Cell ArrangementsĬoccus is one of the three primary shapes of bacteria. This antibiotic resistant strain of Staphylococcus aureus bacteria (yellow), commonly known as MRSA, is an example of cocci shaped bacteria.
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