Fossile de <i><a href="https://fr.wikipedia.org/wiki/Micraster_coranguinum" class="extiw" title="fr:Micraster coranguinum">Micraster coranguinum</a></i> (oursin irrégulier, MNHN).
<a href="//commons.wikimedia.org/wiki/User:FredD" title="User:FredD">FredD</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>