Sea Cucumbers (Holothuroidea) - My Hawaiian Images
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I believe this to be a Stubborn sea cucumber (Holothuria pervicax), or else a Hawaiian yellow-tip sea cucumber (Stichopus sp.2) with atypical coloration, but I'm not certain...I saw many of these bizzare creatures on this dive, engaged in the strange behavior pictured here--the individuals would crawl to the top of a reef pinnacle, stiffen their bodies and lengthen the protrusions on their surface into points, then wave back and forth in the water. I'm investigating...