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Arthropods other than trilobites or bradoriids constitute a major component of many Cambrian Burgess‐Shale‐type Lagerstätten. Owing to their scarcity in other less well‐preserved deposits, they are generally regarded as lightly sclerotized but non‐mineralized. Here we show that Chuandianella ovata, one of the typical lightly sclerotized arthropods from the Chengjiang biota, reinforced its carapace...