Colour SEM of Podocyrtis cothurnata, a radiolarian

Colour SEM of Podocyrtis cothurnata, a radiolarian

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Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Radiolarian. Coloured scanning electron micrograph (SEM) of the test (skeleton) of a Podocyrtis cothurnata, a type of radiolarian protozoan. Radiolarians build these hard, mineral skeletons around themselves as they float in warm seas with other plankton. They extend their protoplasm as pseudopodia (false feet) through pores in the shell to feed on tiny organisms. The radiolarians can change their density in order to vary their depth. Large numbers of radiolarian skeletons litter the sea bed; these become fossilised to form minerals like flint. Magnification: x170 at 6x7cm size. x425 at 5.5x4.75"

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Keywords: animal, flint, invertebrate, invertebrates, nature, origin, plankton, podocyrtis cothur, podocyrtis cothurnata, protozoa, protozoan, radiolaria, radiolarian, test, wildlife, zoology

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