Earthworms typically have between 100 to 150 segments, although the exact number can vary depending on the species and the size of the individual worm. Each of these segments is called a somite and serves a vital role in the worm’s anatomy and movement.
The segments are separated by distinct rings, which contribute to the earthworm’s ability to burrow through soil. As the worm contracts and relaxes its muscles, these segments allow for a coordinated wave-like movement that helps it navigate through its environment.
Additionally, each segment contains specific structures, such as setae (small bristles) that aid in locomotion, and can also house organs important for reproduction and digestion. This segmented body plan is crucial for the overall efficiency and adaptability of earthworms in their ecological niches.