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Additionally, two groups of cnidarians, corals and sea anemones, exhibit six-or eight-fold symmetry. These types of symmetry are referred to as hexamerism and octamerism, respectively. It should be noted that cnidarians are not the only animals to exhibit radial symmetry.
A Reflectional Symmetry is a type of symmetry in which one half of the object is the mirror image of the other. 1  A figure may have both horizontal and vertical lines of reflection. 2  The alphabet V has reflectional symmetry about a vertical line of reflection.  The hexagon has reflectional symmetry about both horizontal and vertical lines of reflection.