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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.
In order to fully define bilateral symmetry, we need to first define symmetry. Symmetry has to do with the orientation of an organism based on a plane or around an axis. Considering the different shapes and orientations of various organisms, scientists have come up with three basic types of symmetry. The three types of body symmetry The first type is radial symmetry.