SEM image of trochophore of <i><a href="//commons.wikimedia.org/wiki/Haliotis_asinina" title="Haliotis asinina">Haliotis asinina</a></i> 11 hours post fertilisation.<br>
pc - protoconch
Daniel J Jackson, Gert Wörheide and Bernard M Degnan
CC BY 2.0
<p>Cropped from Figure 1 <a rel="nofollow" class="external free" href="http://www.biomedcentral.com/1471-2148/7/160/figure/F1?highres=y">http://www.biomedcentral.com/1471-2148/7/160/figure/F1?highres=y</a> from:<br></p>
Daniel J Jackson, Gert Wörheide and Bernard M Degnan: <a rel="nofollow" class="external text" href="http://www.biomedcentral.com/1471-2148/7/160">Dynamic expression of ancient and novel molluscan shell genes during ecological transitions</a>. - BMC Evolutionary Biology 2007, 7:160. doi:10.1186/1471-2148-7-160