Sagittal section of the shell of the “primitive” extant cephalopod species <i>Nautilus macromphalus</i>. The contrast of the photograph was artificially enhanced in order to show the iridescence (structural colors) of the mother of pearl layer that is making up the internal surface of the shell.
<a href="//commons.wikimedia.org/wiki/User:Ibirapuera" title="User:Ibirapuera">Sérgio Valle Duarte</a>  <table class="messagebox plainlinks layouttemplate en" lang="en" dir="ltr" style="margin:2px 10%;width:auto;border:2px solid #aaa;color:#222;border-left-width:8px;border-collapse:collapse;"><tbody><tr><td class="mbox-image" style="padding-left:.9em"><a href="//commons.wikimedia.org/wiki/File:Wikidata-logo.svg" class="image"><img alt="Wikidata-logo.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/30px-Wikidata-logo.svg.png" decoding="async" width="30" height="17" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/45px-Wikidata-logo.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/60px-Wikidata-logo.svg.png 2x" data-file-width="1050" data-file-height="590"></a></td><td class="mbox-text"><a href="https://www.wikidata.org/wiki/Wikidata:Main_page" class="extiw" title="wikidata:Wikidata:Main page">Wikidata</a> has <a href="https://www.wikidata.org/wiki/Q16269994" class="extiw" title="d:Q16269994">entry Sergio Valle Duarte <small>(Q16269994)</small></a> with data related to this item.</td></tr></tbody></table>
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