Annelids are segmented worms who benefit the earth in many ways. As a group they work the soil, letting oxygen in and removing dead and decaying matter, make nutrients more available in the soil and providing a food source for larger animals.
The name annelid comes from the Latin word “annulus,” which means little ring. Annelids' bodies are made up of a series of essentially identical segments running from their heads to their tails.
Some animals which belong to Annelida are Earthworms, Leeches, Polychaetes, Lugworms.