(A) $Cliona$,commonly known as the boring sponge or sulphur sponge,is a genus of sponges that bores through and damages the skeletons of corals and th

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(A) $Cliona$,commonly known as the boring sponge or sulphur sponge,is a genus of sponges that bores through and damages the skeletons of corals and the shells of molluscs. Because it destroys the shells of pearl-producing molluscs,it is considered harmful to the pearl industry.