Mollusca
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Members of Phylum Mollusca have many characteristics that are unique from other phyla. The most obvious morphology is the calcium carbonate shell that all but many members of Class Cephalopoda produce from a special tissue layer called the mantle. Also unique to to Mollusks are chitinous "teeth" called radula coating the tongue. As you can see from the diagram, the coelom is reduced, only found surrounding the heart.