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This is known as a "By the Wind Sailor" jellyfish. It is NOT a true jellyfish and is not a "baby man-o-war" jellyfish, as some writers claim. They are in fact a hydroid colony and generally considered harmless to humans, though some irritation may occur for some people. They are often purple or blue in color, like the Man-O-War -- which is considered to be one of the most dangerous "jellyfish" though it is not a true jelly. The sailor has the clear sail as shown below, which rides above the water to catch the wind and move the colony around. I have seen both Sailors and Man-O-Wars, though not frequently, on Cocoa Beach. The sailor is seldom more than three inches long. The tiny "blue button" is a relative of both.
Learn more about by-the-wind-saliors and jellyfish here.
Learn more about the basics of sailing here
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