painted urchin
... that aggregations of painted urchin have been recorded with a density of 80 individuals per square metre?
... that aggregations of <b id="mwAZM"><a href="./Lytechinus_pictus" id="mwAZQ" rel="mw:WikiLink" title="Lytechinus pictus">painted urchin</a></b> have been recorded with a density of 80 individuals per square metre?