collector urchin
... that the collector urchin is so named because of its tendency to collect debris on its dorsal side?
... that the <b id="mwFQc"><a class="mw-redirect" href="./Collector_urchin" id="mwFQg" rel="mw:WikiLink" title="Collector urchin">collector urchin</a></b> is so named because of its tendency to collect debris on its <a href="./Anatomical_terms_of_location" id="mwFQk" rel="mw:WikiLink" title="Anatomical terms of location">dorsal side</a>?