Template:POTD/2008-06-17
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The 71st plate from German biologist Ernst Haeckel's Kunstformen der Natur, showing radiolarians of the order Stephoidea. Radiolarians form intricate mineral skeletons, usually with a central capsule dividing the cell into inner and outer portions. Radiolarians are found as zooplankton throughout the ocean and are important diagnostic fossils, found from the Cambrian period onwards.Image credit: Ernst Haeckel