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 Sphrozoida Diam Fig Sphrozoum trigeminum sp An annular colony The main mass of the jellycolony is filled up by large alveoles the entire surface is densely covered with spicula and beyond this skeletoncover lie the spherical central capsules each with an oilglobule This species is