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coccus bacteria, coccus
A coccus plural cocci is any bacterium or archaeon that has a spherical, ovoid, or generally round shape It is one of the three distinct bacterial shapes, the other two being bacillus rod-shaped and spiral-shaped cells

Cocci is an English loanword of a modern or neo-Latin noun, which in turn stems from the Greek masculine noun kokkos κόκκος meaning "berry"


Cocci may occur as single cells or remain attached following cell division Those that remain attached can be classified based on cellular arrangement:

  • Diplococci are pairs of cocci eg Streptococcus pneumoniae and Neisseria gonorrhoeae
  • Streptococci are chains of cocci eg Streptococcus pyogenes
  • Staphylococci are irregular grape-like clusters of cocci eg Staphylococcus aureus
  • Tetrads are clusters of four cocci arranged within the same plane eg Micrococcus sp
  • Sarcina is a genus of bacteria that are found in cuboidal arrangements of eight cocci


  1. ^ a b Pommerville, JC 2013 Fundamentals of Microbiology 10th ed Sudbury, MA:Jones & Bartlett p 106 ISBN 9781449647964 
  2. ^ κόκκος Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project

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    Coccus beatiful post thanks!


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