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The different shapes found in bacteria are given below in the table:

Shape

Description

Examples

Bacilli

Rod-like, Cylindrical

Lactobacillus, Bacillus subtilis

Cocci

Spherical or Ellipsoidal

Streptococci (in chains), Staphylococci (in bunches)

Spiral

Helically curved

Aquaspirillum

In addition to these three major shapes, some other unusual shapes of bacteria include filamentous, fusiform, stalked, spore bearing mycelia forms, pleomorphic forms and incomplete spirals (Vibrios) are also seen. 

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