staghorn hydrocoral
... that staghorn hydrocoral grows on a mollusc shell occupied by a hermit crab?
... that <b id="mwBZo"><a href="./Janaria" id="mwBZs" rel="mw:WikiLink" title="Janaria">staghorn hydrocoral</a></b> grows on a mollusc shell occupied by a <a href="./Hermit_crab" id="mwBZw" rel="mw:WikiLink" title="Hermit crab">hermit crab</a>?