Animal Kingdom - Notes | Class 11 | Part 7: Annelida

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4. ANIMAL KINGDOM

PHYLUM ANNELIDA (SEGMENTED / RINGED WORMS): GENERAL CHARACTERS
  1. Grades of organization:
    • Organ system.
  2. Symmetry:
    • Bilateral symmetry.
  3. Germ layers:
    • Triploblastic.
  4. Coelom:
    • Coelomate.
  5. Habit and habitat:
    • Terrestrial, fresh water or marine. Free living or parasitic.
  6. Digestive system:
    • Complete.
  7. Respiratory system:
    • Cutaneous respiration. Some have branchial (gill) respiration.
  8. Circulatory system:
    • Closed type.
  9. Reproduction:
    • Sexual.
    • Earthworms & leeches are monoecious.
    • Neries is dioecious.
    • Development is direct or indirect.
  10. Unique features:
    • Segmentation like rings.
    • Longitudinal and circular muscles help in locomotion.
    • Locomotory organs are setae (in earthworm) or parapodia (in Neries).
    • Excretion by Nephridia.
    • Paired ganglia connected by lateral nerves to a double ventral nerve cord.
  11. Examples:
    • Pheretima (earthworm)
    • Hirudinaria (blood sucking Leech)
    • Neries (aquatic. Parapodia for swimming).

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