FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Radiolarian. Light micrograph of a single shell of a radiolarian. Radiolaria are single-celled protozoans that are found in marine plankton. They have a silicate skeleton with pores through which pseudopodia of protoplasm project to trap food particles. As zooplankton in the ocean their skeletal remains form siliceous ooze on the seabed. Magnification: x180 when printed at 10 centimetres.
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