Gold sponge; <i><a href="//commons.wikimedia.org/wiki/Aplysina_aerophoba" title="Aplysina aerophoba">Aplysina aerophoba</a></i>; Location: Croatia, Istria, Funtana
<a href="//commons.wikimedia.org/wiki/User:Holleday" title="User:Holleday">Holger Krisp</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>