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will reveal that each septum is actually a series of crystalline tubes (trabeculae) with bristle-like calcite fibers.Rugose corals have a unique arrangement of septa which preserves bilateral symmetry, unlike the fully radial symmetry of tabulate and modern scleractinian corals. The first septum to develop is the cardinal septum, marked by a furrow known as the fossula. Next, the counter septum develops on the opposite end of the rim. The straight symmetrical axis

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