Research on the explosive evolution history of Radiolaria after the end Permian Mass extinction

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This research focused the explosive evolutionary history of radiolarian Nassellaria from the late Permian to the middle Triassic with geochemical evidences. Multisegmented Nassellaria, one of the diversified Radiolaria in the present ocean, was originated from the Triassocampe-lineage, and they diversified three or four major sub-lineages, and each lineage evolved to new genera like the genus Corum. In the late Permian, no serious mass extinction signals were recognized in radiolarian fauna, but significant unstable faunal shift was recognized. These events do not correspond to our geochemical data at this time, suggesting the presence of unknown but important paleoceanographic events in this geologic interval.