UNIQUE CHARACTERISTICS PHYLUM CNIDARIA

PHYLUM CNIDARIA

Unique Characteristics:

1. In Greek means 'stinging structure'.
2. Most marines, few fresh water species.
3. e.g : Obelia sp.
4. Eumetazoans
5. Diploblastic(2 well developed tissue layer)
    a)Inner gastrodermis/endoderm
    b)Outer epidermis/ectoderm
    *Gelatinuous mesoglea between layers
6. Radial symmetry
7. Acoelomate
8. Have reproductive circulatory,and gastrovascular systems
9. Possess both muscle and nerve cells
10. No body cavity
11. Exhibit dimorphism/polymorphism ;
    -In the form of polyp (sessile)