Onchidoris bilamellata
... that the nudibranch Onchidoris bilamellata can be found at a population density of more than 1,000 sea slugs per square metre?
... that the <a href="./Nudibranch" id="mwCIQ" rel="mw:WikiLink" title="Nudibranch">nudibranch</a> <i id="mwCIU"><b id="mwCIY"><a href="./Onchidoris_bilamellata" id="mwCIc" rel="mw:WikiLink" title="Onchidoris bilamellata">Onchidoris bilamellata</a></b></i> can be found at a <a href="./Population_density" id="mwCIg" rel="mw:WikiLink" title="Population density">population density</a> of more than 1,000 sea slugs per square metre?