<p>Upperside of test of a Keyhole sand dollar (<i><a href="//commons.wikimedia.org/wiki/Category:Sculpsitechinus_tenuissimus" title="Category:Sculpsitechinus tenuissimus">Sculpsitechinus tenuissimus</a></i> or <i>E. truncatus</i>)
</p><p><a rel="nofollow" class="external text" href="http://www.wildsingapore.com/wildfacts/echinodermata/echinoidea/sandollar/echinodiscus.htm">More about this sand dollar</a> on the wildfacts sheets on wildsingapore.
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For a high res version of this photo, please review the details on <a rel="nofollow" class="external text" href="http://www.wildsingapore.com/photo.htm">about using my photos</a>. When making the request, please include this reference: 031122cjd0023
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/54527470@N00">Ria Tan</a> from singapore
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wildsingapore/2436452688/">Keyhole sand dollar (Echinodiscus tenuissimus)</a>