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clionid

any member of the sponge family Clionidae (class Demospongiae, phylum Porifera), noted for its ability to dissolve and bore into calcium-containing substances, such as limestone, coral, and the shells of mollusks. Clionids occur in all oceans. The clionid larva settles on a calcium-containing substance and develops into an adult as it bores galleries.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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