Scanning electron micrograph (SEM) of a Suriella sp. diatom. Suriella is characterised by its distinctive small, elliptical shape and intricate silica cell wall. They are found in a variety of freshwater and marine habitats. Diatoms contribute significantly to the oxygen in the atmosphere and are a fundamental link in the aquatic food chain. They are among the most diverse species on earth. Estimates of the number of diatom species range from 20,000 to 2 million. Scientists are discovering new species every year. Magnification: x670 when printed 10 centimetres wide.

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Photo credit: © HAKAN KVARNSTROM / SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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