How many different shapes of bacteria are there?

The three basic bacterial shapes are coccus (spherical), bacillus (rod-shaped), and spiral (twisted), however pleomorphic bacteria can assume several shapes. Cocci (or coccus for a single cell) are round cells, sometimes slightly flattened when they are adjacent to one another.

There are three shapes of Bacteria. Cocci is used to describe round bacterium. Bacilli is used to describe those that rod shaped.