A bacillus (plural bacilli), or bacilliform bacterium, is a rod-shaped bacterium or archaeon. Bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of bacteria.

What is rod-shaped bacteria called?

BACTERIA. ... Spherical bacteria are known as cocci, rod-shaped bacteria are bacilli, and spiral-shaped bacteria are spirilla.

Why are bacteria rod shaped?

Bacteria have mechanisms to resist desiccation. However, more the surface area more difficult will it be to resist desiccation. ... Bacteria with the fastest growth rates should be rod shaped and not cocci, since greater rate of nutrient uptake will allow faster growth. b.