Clionaidae

Clionaidae
Modern clionaid borings in an oyster shell
Scientific classification
Kingdom:	Animalia
Phylum:	Porifera
Class:	Demospongiae
Subclass:	Tetractinomorpha
Order:	Hadromerida
Family:	Clionaidae d’Orbigny, 1851
Genera
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Clionaidae is a family of demosponges which are found worldwide. This family is known for boring holes in calcareous material such as mollusc shells and corals, using both chemical and mechanical processes.

Genera within this family include:

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Wikipedia