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

本研究以放射虫从晚二叠世至中三叠世的爆发式演化史为研究对象，以地球化学证据为依据。多节放射虫是现代海洋中一种多样性的放射虫，起源于三叉树谱系，并分化出三个或四个主要亚系，每个亚系演化为Corum属等新属。在晚二叠世，放射虫动物群没有发现严重的大灭绝信号，但发现了显著的不稳定动物群转移。这些事件与我们目前的地球化学数据并不相符，这表明在这一地质间隔中存在着未知但重要的古海洋事件。

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.