Phylum-Coelenterata (Cnidaria)

• The animals are aquatic, mostly marine.
• These may be of two type i.e. medusa (free living) and polyps (sessile).
• Animals are radially symmetrical.
• Animals are diploblastic (body wall consists two layers outer epidermis and inner gastrodermis separated by mesoglea.
• Body cavity is called gastrocoel and forms gut without anus.
• Stinging cells i.e. nematocysts are found in body.
• Reproduction is asexual (budding) and sexual.
• Fertilization is external.

Ex-Hydra ,Jellyfish,Sea-anemone etc.

Hydra 

Hydra

Jelly-fish