Pennate diatom. Light micrograph the diatom Pleurosigma angulatum. Diatoms have an intricately patterned, glass-like cell wall, or frustule. The frustule consists of 2 halves which fit together like the lid and bottom of a box. The frustule is often decorated with rows of tiny holes known as striae, which are arranged radially (in centric diatoms) or on the 2 sides of a central axis (in pennate diatoms). Diatoms are a distinctive group of single-celled algae containing about 100,000 species. They form a large part of the plankton in marine and freshwater food chains. Magnification: 106x
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