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The stunning collection of pulsating organisms is a mixed group of jellyfish, including the Moon Jellyfish (Aurelia aurita) and a… The stunning collection of pulsating organisms is a mixed group of jellyfish, including the Moon Jellyfish (Aurelia aurita) and a species of Sea Nettle (Chrysaora genus). In my decades studying marine life, I find these communal displays to be particularly beautiful, as they highlight the incredible diversity within a single class of animals. The Moon Jellyfish, with their classic, circular bells and four distinct gonads, are juxtaposed with the Sea Nettles, which have longer, more defined oral arms and tentacles trailing behind their bells. Jellyfish are invertebrates with a simple, yet highly effective, design. They are both graceful drifters and effective hunters, using the rhythmic pulsing of their bells to maneuver through the water. While they share this basic form and method of movement, their differences in body shape, size, and hunting appendages showcase the remarkable evolutionary adaptations within this group of ancient marine creatures.