cactus urchin
... that the deep sea cactus urchin may be a filter feeder, a very unusual method of feeding for a sea urchin?
... that the deep sea <b id="mwAcs"><a href="./Dermechinus" id="mwAcw" rel="mw:WikiLink" title="Dermechinus">cactus urchin</a></b> <i id="mwAc0">(pictured)</i> may be a <a href="./Filter_feeder" id="mwAc4" rel="mw:WikiLink" title="Filter feeder">filter feeder</a>, a very unusual method of feeding for a sea urchin?