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Phylum Cnidaria
Tuesday 16 August 2016 • 00:45 • 0 comments
Phylum Cnidaria



Unique Characteristics of Phylum Cnidaria

Level of organization        : Tissue 
Body Plan               : Radial Symmetry 
Body Cavity                      : Acoelomate 
Germ Layers                     : Diploblastic
                                                           
Diploblastic consists of :

- ectoderm (outer tissue layer) [ protective epidermis ]
- endoderm ( inner tissue layer)  [ secretes  digestive juices into internal cavity ]
Obelia sp. (Hydra)
ObeliaColony2Label.jpg

e.g. Hydra, Obelia sp.
Segmentation                      : Unsegmented
Has tentacles :  Long, hollow structure for
locomotion and food
capturing
Cnidocyte, nematocyst or stinging cells in the tentacles
-     Defense
-    Capturing prey
Dimorphism/polymorphism (two basic body forms):

Both forms are diploid (Polyp & Medusa)
Polyp forms : -Tubular body, mouth directed upward


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