Oligochaeta

Oligochaeta is a class of segmented worms within the phylum Annelida, commonly known as earthworms. They are characterized by their long, cylindrical bodies divided into many segments, which aid in movement and flexibility. Oligochaetes are terrestrial or freshwater dwellers that play a crucial role in soil health by breaking down organic matter, enriching the soil with nutrients. They possess simple hearts, a primitive nervous system, and lack respiratory pigments, breathing directly through their skin. Their burrowing activity aerates and mixes the soil, making them vital for healthy ecosystems and agriculture.