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 |
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