Do wonderpus and mimics spend time burrowed in the sand? There are a couple of octopus that I know of that do...the long arm and short arm sand octopus. The short arm sand octopus was described just a few years ago, and I believe the long arm sand octopus may have yet to be described. I've seen both in Hawaii, and your pic looks somewhat like the undescribed long arm sand octopus peeking out of the sand as seen in this pic - http://sealifeimages...8kbYH. Another similarity is the yellow breathing tube (for lack of the correct term). An expert on these guys, and who was involved with describing the short arm sand octopus, is Crissy Huffard of UC Berkeley. I don't know if she's still associated with Berkeley, but a little Google work may locate her.