NON-CHORDATES

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  • Kingdom Animalia or the Animal Kingdom is broadly classified into two groups, i.e., Non-chordates and Chordates.
  • Chordates are the animals those who exhibit a notochord at some stage of their life. Similarly, Non-chordates are the animals those don’t possess notochord at any stage of their life.
  • Notochord (Gr., noton=back,  L., chorda=cord) is a cartilagenous string or rod like stucture present along the back of  chordates, at some stage of their life or throughout the life.
  • Sub-kingdom Non-chordata is further classified into 9 phyla, namely:
  1. Porifera
  2. Coelenterata or Cnidaria
  3. Platyhelminthes
  4. Nemathelminthes
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata     





  • Earlier, Phylum Protozoa​ was also included under Animal kingdom, but since, they are microscopic unicellular organisms, now a days they are studied under the phylum Protista.

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