This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Liosphrida et Astrosphrida Diam Fig Haliomma lirianthus sp Fig Medullary shell Fig Three pores of the cortical shell Fig Carposphra nodosa sp Fig The medullary shell is visible the upper half of the cortical shell being taken off Fig Heliosoma radians sp Fig Medullary shell