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 emitting whitish material...I can only assume they were spawning.