Annelids

Annelids are segmented worms of the phylum Annelida that include earthworms and leeches. They are some of the most successful invertebrates in aquatic and terrestrial habitats around the world, known for their ability to inhabit a wide range of environments and their roles in oxygenating soil, cycling nutrients, and providing food sources. They have a segmented body with a true coelom and an exterior composed of layers of cuticle, muscle, and connective tissue. This gives them greater physical protection and an increased surface area for muscle attachment, enabling them to crawl and burrow. Annelids are important for their role in the food chain, as they feed on decaying organic matter, serving as a vital source of nutrition for other organisms. They are also important in the roles they play in helping maintain ecosystems.