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Coccus (plural cocci) is a term used to describe any bacterium 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. Coccus is an English loanword of a Neolatin noun, which in turn stems from the Greek masculine noun ''kokkos (κόκκος)'' meaning "berry". == Arrangements == 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 (e.g. ''Streptococcus pneumoniae'' and ''Neisseria gonorrhoeae'') *Streptococci are chains of cocci (e.g. ''Streptococcus pyogenes''). *Staphylococci are irregular (grape-like) clusters of cocci (e.g. ''Staphylococcus aureus''). *Tetrads are clusters of four cocci arranged within the same plane (e.g. ''Micrococcus sp.''). *''Sarcina'' is a genus of bacteria that are found in cuboidal arrangements of eight cocci. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coccus」の詳細全文を読む スポンサード リンク
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