1/13/2024 0 Comments Common bacteria shapesStaphylococcus 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. Types Coccus 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. Other arrangements include pairs, tetrads, clusters, chains and palisades. 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. ( Discuss) Proposed since December 2023.īacteria 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. It has been suggested that Coccobacillus be merged into this article.
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