A fivespot of fourspots
These are fourspot butterflyfish, so called because the two spots seen here on each of them are matched by two more on the other side.
In my attempts to identify what I see in the water, I use John P. Hoover’s book The Ultimate Guide to Hawaiian Reef Fishes, Sea Turtles, Dolphins, Whales, and Seals. His website is hawaiisfishes.com.
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