• Cnidarians are invertebrates such as jellyfish and corals.
  • They belong to the phylum Cnidaria.
  • There are more than 10,000 cnidarian species.
  • They are a little more complex than sponges.
  • They have radial symmetry and tissues.
  • They may exist in the polyp (left) or medusa (right) form.
  • Some species alternate between polyp and medusa forms.
  • Other species exist in just one form or the other.
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