This is a well preserved old <a href="https://en.wikipedia.org/wiki/Exoskeleton" class="extiw" title="w:Exoskeleton">skin</a> of a white Crayfish (<a href="https://en.wikipedia.org/wiki/Procambarus" class="extiw" title="w:Procambarus">Procambarus sp.</a> ) after <a href="https://en.wikipedia.org/wiki/Moulting" class="extiw" title="w:Moulting">moulting</a>. This skin was soon eaten by the crayfish itself (losslessly cropped from camera JPEG file by using <a href="https://en.wikipedia.org/wiki/jpegtran" class="extiw" title="w:jpegtran">jpegtran</a>).
<a href="//commons.wikimedia.org/wiki/User:Mlogic" title="User:Mlogic">Mlogic</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>