Causes of the last global deep-sea extinction from the analyses of foraminiferal tests

我分析了最近一次全球深海灭绝的原因，这些特定的海底有孔虫是在中更新世过渡期间灭绝的。根据它们的内部测试形态，发现它们与其他在测试中结构相似的底栖有孔虫具有较弱的系统发育关系。在已灭绝的有孔虫的测试中发现了光学颗粒状结构，表明它们有很深的底栖微生境。上一次全球深海灭绝暗示，它可能与中更新世期间深海冷却和深海氧化环境变得更加氧化有关。

I analysed the causes of the last global deep-sea extinction of the particular benthic foraminifera during the mid-Pleistocene Transition. On the basis of their internal test morphology, they were found to have weak phylogenic relationship among other benthic foraminifera that shows similar structure inside the test. Optically granular structure were found in the test of extinct foraminifera and suggested their deep infaunal microhabitat. The last global deep-sea extinction was implied that it might have occurred in associated with cooling deep-water and becoming more oxidised environments at deep-sea during the middle Pleistocene.