The image above shows part of the filter structure of the <a href="//commons.wikimedia.org/w/index.php?title=Antarctic_krill&amp;action=edit&amp;redlink=1" class="new" title="Antarctic krill (page does not exist)">Antarctic krill</a>: The first order <a href="//commons.wikimedia.org/w/index.php?title=Filter_setae&amp;action=edit&amp;redlink=1" class="new" title="Filter setae (page does not exist)">filter setae</a> have the second order setae attached to them. The second order setae are aligned in rows, these rows form a v-shape, the v shape of the setae are aligned towards the inside of the <a href="//commons.wikimedia.org/w/index.php?title=Feeding_basket&amp;action=edit&amp;redlink=1" class="new" title="Feeding basket (page does not exist)">feeding basket</a>. The purple ball shown trapped in the second order setae is one micrometer big, it is possible that this is a <a href="//commons.wikimedia.org/w/index.php?title=Bacterium&amp;action=edit&amp;redlink=1" class="new" title="Bacterium (page does not exist)">bacterium</a>. To display the total area of this fascinating structure one would have to reproduce this image <a rel="nofollow" class="external text" href="http://www.ecoscope.com/krill/filter/filter7/index.htm">tile </a> 7500 times.
Photo by Gerd Alberti &amp; <a href="//commons.wikimedia.org/wiki/User:Uwe_kils" title="User:Uwe kils">Uwe Kils</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span> <b>and</b> <a rel="nofollow" class="external free" href="http://www.ecoscope.com/krill/filter/filter4/index.htm">http://www.ecoscope.com/krill/filter/filter4/index.htm</a>