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Potential sources of food can also influence Radiolaria behavior. Although they may possess symbiotic relationships and can act as particle feeders (meaning they just hang out and wait for food), radiolarians have a darker side to them -- they can also act as predators. When feeding as predators, Radiolaria may capturediatoms, tintinnids, and other calcareous organisms by ingesting them into their central cavity. They trap their prey on the peripheral network of rhizopodia. The symbiotic relationship that radiolarians share with dinoflagellates enable them to use a jelly-like layer to trap their prey.

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