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jellyfish ocean underwater marine life tentacles bioluminescence stinger stinging cells cnidarians invertebrates aquatic translucent free-swimming predators prey filter feeders zooplankton microscopic planktonic jelly-like bell-shaped radial symmetry tentacles oral arms gastrovascular cavity mesoglea nerve net rhopalia statocysts ocelli bioluminescence chromatophores iridescence reflectivity light scattering counter-illumination camouflage mimicry predation defense symbiosis mutualism commensalism parasitism