Here are some additional details:

* Spirilla are bacteria with a rigid, helical (spiral) shape.

* They are typically longer and thicker than spirochetes, another type of spiral-shaped bacterium.

* Spirochetes have a more flexible helical shape and move by rotating around their long axis.

* Spirilla move by using flagella (whip-like appendages) that are located at the ends of the cell.

Let me know if you have any other questions!