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 Porodiscida Diam Fig Rhopalastrum malleus sp Fig Rhopalastrum ypsilinum sp Fig Rhopalastrum hexaceros sp Fig Rhopalastrum triceros sp Fig Rhopalastrum trispinosum sp vel Dictyastrum trispinosum Fig Rhopalastrum arcticum sp Fig Rhopalastrum hexagonum sp vel Dictyastrum