How to draw Cnidaria Diagram || निडारिया || Phylum- Coelenterata || zoology diagram ||

How to draw Cnidaria Diagram || निडारिया || Phylum- Coelenterata || zoology diagram || #cnidaria

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CHARACTERS AND CLASSIFICATION OF CNIDARIA:-

Introduction:-

Phylum Cnidaria or coelenterate includes diverse animals like jelly fish, sea anemones, corals and the more familiar Hydra. They are diploblastic eumetazoans with tissue grade of organization. The cnidarians are characterized by the presence of Cnidocytes, polyp and medusa forms.

General Characters of Phylum Cnidaria:-

1. These are mostly marine and a few like hydra live in fresh water

2. Many are colonial (Eg: Corals). Some are solitary (Eg: sea anemone)

3. They are diploblastic and show tissue grade of organization

4. The body is radially symmetric but sea anemones show biradial symmetry 5. Polyp and medusa re the two different forms of cnidarians. Polyp is hydroid

form which is sessile with mouth-up orientation. Medusa is umbrella or bell

shaped with mouth down orientation. It swims by constricting the bell.

6. The body wall is composed of an outer epithelium called as epidermis, an inner epithelium called gastrodermis, a gelatinous mesoglea between the outer and inner epidermis. Mesoglea consists of amoeboid cells derived from ectoderm. Mesoglea is thin in polyps. It is thick in medusa, in which it is important in buoyancy.

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