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Thysanozoon sp.
This beautiful flatworm was speckled with blue spots and was about 3cm long.
Coral Reef. Spotted at Arthur's Rock on a Night Dive.
Yes, it very well could be! You'll notice that many/most Thysanozoon sp. have white borders: http://reefguide.org/watermark.php?src=p...
I think you're right, though, because I just found a photo of a Thysanozoon that looks almost exactly like your spotting! However, there's no species name listed: http://calphotos.berkeley.edu/imgs/128x1...
Hi Mauna. It was black on the bottom, not whitish like the Aconthozoon sp. Could it be the Thysanozoon sp instead? Thanks.