有孔虫和放射虫是海洋原生动物中种类多、数量大的两个类群,在世界各大洋都有分布。这些细小的动物死亡后的遗骸沉积覆盖于海底占有相当大的面积(放射虫占海底总面积的3％—4％,而有孔虫竞占整个洋底1╱3以上)。由于它们对温度、盐度和深度等环境因 Foraminifera and radiolarians are two groups of marine protozoa with many species and large numbers, which are distributed in every ocean of the world. The remains of these small animals, which have been deposited as dead, cover a significant area of ​​the sea floor (radiolarians account for 3% -4% of the total area of ​​the sea floor, while foraminiferal species occupy 1/3 of the entire floor of the ocean floor). Due to their environmental factors such as temperature, salinity and depth