Phylum Coelenterata (Cnidaria) –

– Aquatic (marine), Sessile or free living.

– Presence of Cnidoblasts or Cnidocytes – Stinging cells.

– Cnidoblasts are for defence, anchorage or predation.

– Tissue level body organisation.

– Diploblastic.

– Central gastro vascular cavity, single opening mouth.

– Two body forms – Polyp (Asexual), Medusa (Sexual) stage.

-eg Hydra, Physalia, Obelia, Aurelia etc.

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