This is a male of an as-yet un-named octopus species extending his hectocotylus arm to mate with a female in the background. These octopuses excel in mimicry of staghorn coral rubble. Pictured here, the female at the end of the male's arm looks remarkably like a piece of dead, broken coral. The two were approximately 70cm apart. Photographed in Kagoshima Prefecture, Japan.
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