<i>Protoreaster nodosus</i>. In one of my night dives, the sand bottom was filled with many of these gigantic marshmallow starfishes.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/31119263@N00">Samuel Chow</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/31119263@N00/234933965">Horned Sea Star (30 cm)</a>