• Cocci (spherical)
• Bacillus (rod shape)
• Spirilla (spiral)
• Vibrios (Comma shaped)
• Spirochaetes.

• Gram positive bacteria
• Gram negative bacteria

Hello. Bacteria are classified into five groups according to their basic shapes:

1) spherical (cocci)

2)  rod (bacilli)

3) spiral (spirilla)

4) comma (vibrios)

5) corkscrew (spirochaetes)

Hope that helps !