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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.
Examples of organisms with radial symmetry are starfish and sea urchins. Bilateral symmetry is often seen in animals that are motile. The symmetry helps the body be streamlined, allowing the organism to move. Two organisms that have bilateral symmetry other than the roundworm are butterflies and crabs.