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Bacteria shapes and arrangement11/22/2023 Coccobacilli rods are so short and wide that they resemble cocci. The word coccobacillus reflects an intermediate shape between coccus (spherical) and bacillus (elongated). Ĭoccobacillus Coxiella burnetii ( TEM)Ī coccobacillus (plural coccobacilli) is a type of rod-shaped bacteria. Streptobacilli: Bacilli arranged in chains.Diplobacilli: Two bacilli arranged side by side with each other.There is no connection between the shape of a bacterium and its colors in the Gram staining.īacilli usually divide in the same plane and are solitary, but can combine to form diplobacilli, streptobacilli, and palisades. Although Bacillus, capitalized and italicized, specifically refers to the genus, the word bacillus (plural bacilli) may also be used to describe any rod-shaped bacterium, and in this sense, bacilli are found in many different taxonomic groups of bacteria. Staphylococcus spp.)Ī bacillus (plural bacilli) is a rod-shaped bacterium. groups of four or eight known respectively as tetrads and sarcina (e.g. ![]() Arrangements Ĭoccoid bacteria often occur in characteristic arrangements and these forms have specific names as well listed here are the basic forms as well as representative bacterial genera: Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis. This is the first of many taxonomic traits for identifying and classifying a bacterium according to binomial nomenclature. Describing a bacterium as a coccus, or sphere, distinguishes it from bacillus, or rod. Other arrangements include pairs, tetrads, clusters, chains and palisades.Ĭoccus Arrangement of cocci bacteria : Staphylococcus bacteriaĪ coccus (plural cocci, from the Latin coccinus (scarlet) and derived from the Greek kokkos (berry)) is any microorganism (usually bacteria) whose overall shape is spherical or nearly spherical. But, there are also other morphologies such as helically twisted cylinders (example Spirochetes), cylinders curved in one plane (selenomonads) and unusual morphologies (the square, flat box-shaped cells of the Archaean genus Haloquadratum). ![]() Generally, the basic morphologies are spheres (coccus) and round-ended cylinders or rod shaped (bacillus). ![]() Their direct examination under the light microscope enables the classification of these bacteria and archaea. Bacteria display a large diversity of cell morphologies and arrangementsīacterial cellular morphologies are morphologies that are characteristic of various types bacteria and often a key factor in identifying bacteria species.
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