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Classification of Bacteria according to morphologic characteristics

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Bacteria are microorganisms, their dimensions  can be measured with micrometer and they are about 0.2 to 10 or even more micrometers which means that they can be seen by regular microscopes. 
According to their shape, bacteria can be classified in to three groups:
Spherical or Coccus (Lat. Coccus – Round Fruit )
Cylindrical or Bacillus (Lat. Bacillus - Chopsticks )
Twisted or Spiral
Most of the Coccus are spherical but they can be elliptical, or a form like beans.
Bacillus- can be long, short, thin or thick, then can be also shaped.
Spiral form bacteria – can be in a form like coma and different dimensions. 

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