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An akinete is a thick-walled dormant cell derived from the enlargement of a vegetative cell. It serves as a survival structure. It is a resting cell of cyanobacteria and unicellular and filamentous green algae. Under magnification, akinetes appear thick walled with granular-looking cytoplasms.

Development of akinetes from a vegetative cell involves:

  1. increase in size
  2. gradual disappearance of gas vacuoles
  3. increase in cytoplasmic density, number of ribosomes & cyanophycin granules

The akinetes are filled with food reserves, and have a normal cell wall surrounded with 3 layer coat.