Chapter 4 Animal Kingdom
BASIS OF CLASSIFICATION
1. Levels of organization: Classified according to the pattern of the organization of cells.
2. Symmetry: Classified on the basis of the symmetry of their bodies.
3. Diploblastic and Triploblastic organization: Animals in which the cells are arranged in two embryonic layers, are called diploblastic. Those animals in which the developing embryo has an additional third germinal layer, are called triploblastic animals.
4. Coelom: Classification is done on the basis of the presence or absence of a cavity between the body wall and the gut wall called coelom.
5. Segmentation: In some animals, the body is externally or internally divided into segments with a serial repetition of at least some organs.
6. Notochord: Classification is done on the basis of the presence or absence of the notochord which is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals.
CLASSIFICATION OF ANIMALS
The subphylum Vertebrata is further divided as follows:
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