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A cicada-like creature called the treehopper has a third pair of wings in a reversal of usual insect evolution, French scientists say. Previous research suggested the helmet came from exoskeletal plates on the first thoracic segment. Prud'homme and his team say it is actually a fused pair of wings, although it is not used for flying. The researchers say the treehoppers' helmet is the first known example of new body appendages appearing in more than 250 million years of insect evolution.