Classification of Animal Kingdom on basis of Body Symmetry
Animals can be divided based on their symmetry or overall shape of the organism.
A. Bilateral symmetry
B. Radial symmetry
In bilateral symmetry the animals can be divided into identical right and left parts in only one plane.
In radial symmetry body can be divided into identical parts through any plane passing through the central axis of the body. E.g.: Coelenterates, ctenophores and echinoderms.
In A symmetrical organism, the body cannot be divided into equal halves through any axis of the body.