Enlist the main features of phylum Annelida

Enlist the main features of phylum Annelida. Give examples.


  • Body of annelids are bilaterally symmetrical.
  • They are triploblastic.
  • Metameric segmentation is present.
  • Closed circulatory system with respiratory pigment dissolved in the plasma.
  • Nephridia for excretion and osmoregulation are present.
  • These animals are found in a variety of habitats like fresh water, marine water as well as on land.
    Examples are: Nereis (sand worm or clam worm), Aphrodite (sea mouse), Pheretima (earthworm).