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Lingulata: More on Morphology

Unlike the shells of almost all other marine organisms, which are typically made of calcium carbonate, the shells of lingulids are composed of calcium phosphate. The rest of the body is fairly typical of brachiopods in general, but the pedicle is quite long. This facilitates burrowing; extant Lingula is typically found burrowed in soft muddy sediments with only the valve edges protruding.

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