What shape is characterized by Spirillium bacteria?

Spirillium bacteria are characterized by their spiral shape, which sets them apart from other bacterial forms. This unique morphology allows spirilla to be motile, often aided by flagella that are typically located at both ends of the cell. This shape is ideal for swimming through liquids, which is particularly advantageous in their natural aquatic environments.

The spiral structure of Spirillium contributes to its flexibility and movement, contrasting with other types of bacteria. For example, rod-shaped bacteria, known as bacilli, are straight and elongated, while cocci are spherical in shape. The square shape is not a common characteristic found in any bacteria. Thus, the spiral shape is the defining feature that accurately represents Spirillium bacteria.