A long thin holothurian sea cucumber (<i><a href="//commons.wikimedia.org/wiki/Category:Synapta_maculata" title="Category:Synapta maculata">Synapta maculata</a></i>).
David Burdick / NOAA
<a rel="nofollow" class="external free" href="https://photolib.noaa.gov/Collections/Coral-Kingdom/Other/emodule/752/eitem/31861">https://photolib.noaa.gov/Collections/Coral-Kingdom/Other/emodule/752/eitem/31861</a>