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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.
Radial Symmetry: Animals having symmetry around a central axis. Animals with radial symmetry are diploblastic. Bilateral Symmetry: Symmetry in which the body can be divided into 2 mirror-image halves.haracter izing a body shaped like a pie or barrel, with many equal parts radiating outward like the spokes of a wheel; present in cnidarians and echinoderms. radiation ... radial symmetry.