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1. Marrellomorpha: Marrellomorpha are an extinct group of arthropods known from the Cambrian to the Early Devonian. They lacked mineralised hard parts, so are only known from areas of exceptional preservation, limiting their fossil distribution. (Extinct class of arthropods) [100%] 2022-10-17 [Marrellomorpha] [Paleozoic arthropods]...