black brittle star
... that the black brittle star and its associate the common brittle star may form beds on the sea floor extending hundreds of square metres and consisting of millions of individuals?
... that the <b id="mwCng"><a href="./Ophiocomina_nigra" id="mwCnk" rel="mw:WikiLink" title="Ophiocomina nigra">black brittle star</a></b> <i id="mwCno">(pictured)</i> and its associate the <a href="./Ophiothrix_fragilis" id="mwCns" rel="mw:WikiLink" title="Ophiothrix fragilis">common brittle star</a> may form beds on the sea floor extending hundreds of square metres and consisting of millions of individuals?