Definition
An oligochaete worm is a type of segmented worm belonging to the class Oligochaeta, known for having few bristles (setae) per segment. These worms primarily inhabit terrestrial and freshwater environments. Earthworms are a common example, playing a vital role in soil aeration and nutrient cycling. They lack distinct head appendages and possess a clitellum for reproduction. Think of them as nature's tiny tillers!