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Coccus(spherical), bacillus (rod like),vibrio(comma shaped) and spirillum(spiral shaped) are the four basic shapes of bacteria.
Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes).
spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes).