Coccus-shaped bacteria are classified based on their arrangement as follows:

  • Monococcus: Single spherical cell.
  • Diplococcus: Pair of cocci.
  • Streptococcus: Chain of cocci.
  • Tetrads: Group of four cells.
  • Staphylococcus: Irregular clusters.
  • Sarcinae: Group of eight cells.