Spirilla bacteria are best described as what shape?

Spirilla bacteria are best described as spiral in shape, which is characteristic of this type of bacteria. Their distinctive helical or corkscrew appearance allows them to move in a corkscrew motion, which can be advantageous for navigating through viscous environments, such as those found in the human body or in water. This shape is adaptive and is a key identifying feature that differentiates spirilla from other bacterial forms.

Round-shaped bacteria are typically referred to as cocci, while rod-shaped bacteria are known as bacilli. Filamentous bacteria, on the other hand, can refer to various forms that are elongated or threadlike. Understanding these distinct morphological classifications helps in the identification and study of different bacterial species.