What is the scientific name for segmented worm?

IS A KIND OF INVERTIBRATE,IN SCIENTIFIC NAME:(PHYLUM ANELLIDA)OR SEGMENTED WORM lack a true exoskeleton. In place of the tough outer covering that protects the other creatures to which they are related, segmented worms have developed fluid-filled bodies for rigidity of form. Although given only scant consideration by most people, including aquarists, this phylum contains creatures of immense importance to hobbyists and nonhobbyists alike