Drawing of <a href="https://en.wikipedia.org/wiki/Ram%27s_Horn_Squid" class="extiw" title="en:Ram's Horn Squid">Ram's Horn Squid</a> <i>Spirula spirula</i> with cross section showing the placement of its shell
<bdi><a href="https://www.wikidata.org/wiki/Q58300160" class="extiw" title="d:Q58300160"><span title="Czech malacologist and Wikipedian">Michal Maňas</span></a>
</bdi>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>