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Phyllidia coelestis
Three black lines (with the middle one often broken), on a powder-blue mantle, identify this nudibranch as P. coelestis. It has yellow-tipped pustules running down its length (but the pustules do not form a straight line). Its rhinophores are also yellow-colored. Along the edge of its mantle are smaller-sized pustules that are blue-colored.
I spotted this nudibranch at a depth of about 70 feet, during a day dive at Punk Rock, Samal Island.
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