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 Stylosphrida Druppulida et Spongurida Diam Fig Stylatractus giganteus sp vel Amphistylus giganteus Fig Stylatractus sethoporus sp The greater part of the cortical shell taken off Fig Stylatractus sethoporus sp The entire cortical shell Fig Stylatractus compactus sp Fig Amphisphra