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JELLYFISH | WHAT DO YOU KNOW ABOUT THEM?

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Jellyfish belong to the phylum Cnidaria , which is derived from the Greek word Cnidae , literally meaning "stinging," and includes sea anemones, cerianthus and reef-building corals, as well as gorgonians, alcyonians and pearl coral. Organized like an umbrella, the jellyfish body consists of an umbrella that allows a manubrium to dangle, in its center ending in a mouth. The umbrella is fringed with threads called tentacles. There is a huge variety of jellyfish, about a thousand species, ranging in diameter from a few millimeters (75% of jellyfish invisible to the naked eye) to two meters. Shapes are also very diverse: round, square, flat, dome-shaped, massive or airy...