GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Diatom on green algae. Differential interference contrast micrograph of a Hyalodiscus sp. diatom. Diatoms are a group of photosynthetic, single-celled algae containing about 10,000 species. They form an important part of the plankton at the base of the marine and freshwater food chains. Their characteristic feature is the intricately patterned glass-like cell wall, or frustule, which often has rows of tiny holes, known as striae. Magnification: x900 when printed 10 centimetres wide.
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