Diatoms are a distinctive group of single-celled algae containing about 10,000 species. They form a large part of the plankton in marine and freshwater food chains. They consist of two valves, made of silica, which fit together like the top & bottom of a box. The exterior of the valves are often highly decorative, with pores, spikes or other types of projections. Magnification 50x.
June 6th, 2013
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