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Researchers May Have Discovered The Largest Arthropod That Ever Lived/ The Biggest Animal On Land During The Carboniferous. The Arthropod Fossil, A Monstrous Millipede Ancestor About 326 Myrs Old, Called Arthropleura, Was Discovered In 2018 In Northumberland, NE England. The Car-Sized Millipede Was ~8.5 ft (2.6 m) Long And Weighed ~110 Pounds (50Kg).