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 Castanellida Diam Fig Castanissa challengeri sp In the lower part of the figure is visible the large corona of teeth around the mouth Fig Castanidium moseleyi sp In the upper part of the figure at left is visible the irregular polygonal mouth Fig Castanopsis naresi sp In the