Heteranomia squamula (the prickly jingle) a bivalve from the family Anomiidae
Georges Jansoone (<a href="//commons.wikimedia.org/wiki/User:JoJan" title="User:JoJan">JoJan</a>)
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span> - photo made at an sea aquarium