WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Differential interference contrast light micrograph of Licmophora flabellata sessile marine diatoms. This fan-shaped diatom attaches to seaweeds via its stalk. Each induvial cell has four chloroplasts, the organelle of photosynthesis (yellow), and each chloroplast has a pyrenoid. 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. The characteristic feature of diatoms is their intricately patterned, glass-like cell wall, or frustule. The frustule often has rows of tiny holes, known as striae. Magnification: x250 when printed 10 centimetres wide.
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