<i>Donax fossor</i> from Fort Tilden, Queens, NYC. Upper right are three live individuals the rest are paired valves, lower center is the interior of a pair. The largest pair is on the lower right (white) they are 21.2 mm in length
<a href="//commons.wikimedia.org/wiki/User:Invertzoo" title="User:Invertzoo">Invertzoo</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>