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Researchers May Have Discovered, In A Sedimentary Rock Called The Wulongqing Formation In Yunnan, China, The Oldest Parasite Stuck To Its Host Some 510 Million Years Ago. The Tube-like Shaped Parasites, Called Neobolus Wulongqingensis, Are Said To Have Exhibited kleptoparasitism, Where They Steal Food From The Host Brachiopods, A Filter Feeder.