plume worm
... that reefs formed by the developing plume worm are sometimes broken apart by the activity of the red boring sponge?
... that reefs formed by the developing <b id="mwBaM"><a href="./Serpula_vermicularis" id="mwBaQ" rel="mw:WikiLink" title="Serpula vermicularis">plume worm</a></b> <i id="mwBaU">(pictured)</i> are sometimes broken apart by the activity of the <a href="./Cliona_celata" id="mwBaY" rel="mw:WikiLink" title="Cliona celata">red boring sponge</a>?