radioles
... that while they are primarily feeding structures, radioles also serve as respiratory organs for certain sessile marine polychaetes?
... that while they are primarily <a href="./Filter_feeder" id="mwE_I" rel="mw:WikiLink" title="Filter feeder">feeding</a> structures, <b id="mwE_M"><a href="./Radiole" id="mwE_Q" rel="mw:WikiLink" title="Radiole">radioles</a></b> <i id="mwE_U">(pictured)</i> also serve as <a href="./Aquatic_respiration" id="mwE_Y" rel="mw:WikiLink" title="Aquatic respiration">respiratory</a> organs for certain <a class="mw-redirect" href="./Sessility_(limnology)" id="mwE_c" rel="mw:WikiLink" title="Sessility (limnology)">sessile</a> <a class="mw-redirect" href="./Marine_(ocean)" id="mwE_g" rel="mw:WikiLink" title="Marine (ocean)">marine</a> <a class="mw-redirect" href="./Polychaeta" id="mwE_k" rel="mw:WikiLink" title="Polychaeta">polychaetes</a>?