Scientific name: Annelida Higher classification: Lophotrochozoa Kingdom: Animalia  The annelids, also known as the segmented worms, are a large phylum, with over  22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zonesand hydrothermal vents, others in fresh water, and yet others in moist terrestrial...