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Tip of right fluke.
Could this be a barnacle molt? It was clear, the main part about 2" long, just a floating blob but pretty! This photo taken with a macro lens shows some beautiful detail, like little spirals.
Maxillopoda is a diverse class of crustaceans including barnacles, copepods and a number of related animals. It does not appear to be a monophyletic group, and no single character unites all the members.