据估计 ,深海有孔虫种的交替速率为２ %／Ｍａ ,比新生代浅水底栖（５ %／Ｍａ）或者浮游有孔虫（１１ %／Ｍａ）明显偏低。白垩纪—第三纪边界（６５Ｍａ）或附近的事件引发了陆地和浅水以及部分半远洋生物的灾难性绝灭 ,但是对深海底栖有孔虫的影响很小。大部分深海有孔虫绝 It is estimated that the alternation rate of foraminifera species in the deep sea is 2% / Ma, which is obviously lower than that of the Cenozoic shallow benthic (5% / Ma) or planktonic foraminifer (11% / Ma). Cretaceous - Tertiary boundary (65Ma) or nearby events triggered a catastrophic extinction of terrestrial and shallow water and some semi-oceanic organisms, but had little effect on deep-sea benthic foraminifera. Most deep-sea foraminifera absolutely