Odontosyllis phosphorea
... that the fireworm Odontosyllis phosphorea lives unobtrusively on the seabed but rises to the surface and produces a sparkling display when it breeds?
... that the <a class="mw-redirect" href="./Fireworm" id="mwBcI" rel="mw:WikiLink" title="Fireworm">fireworm</a> <i id="mwBcM"><b id="mwBcQ"><a href="./Odontosyllis_phosphorea" id="mwBcU" rel="mw:WikiLink" title="Odontosyllis phosphorea">Odontosyllis phosphorea</a></b></i> lives unobtrusively on the seabed but rises to the surface and produces a <a href="./Bioluminescence" id="mwBcY" rel="mw:WikiLink" title="Bioluminescence">sparkling</a> display when it breeds?