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The web sure shows a lot of variations, LOL. In Tropical Pacific Invertebrates is also the only book match I see that looks like this.I have the Nudibranches of the world, debelius encyclopedia, that was my conclusion also, but it shows so many variations, was not sure.
Now that would be a sight to see.These two spent around 20 minutes dancing with each other before they settled for this photo.
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Target practice??!!!!And this is the eagle ray, used as target practice by those that are supposed to protect.