Phylum: Annelida (segmented worms), its classification and characteristics
multicellular, triploblastic, bilaterally symmetrical with system grade of body organization. mostly aquatic, found in sea water or fresh water, some are terrestrial and burrowing, few are ecto-parasitic. body is elongated, cylindrical and metamerically segmented (body divided into many similar segments). body is covered by non-chitinous cuticle secreted by ectoderm. complete and straight alimentary canal. coelomate. … Read more