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An introduction to Radiolaria - an organism over 500 million years old!
Radiolaria are a water-dwelling single-cell micro-organism. They measure a minuscule 0.1-0.2mm and have beautifully intricate mineral skeletons, usually made of silica. They are a type of zooplankton and float freely around oceans, seas, and freshwater areas, feeding on smaller animals and minerals.