Scanning electron micrograph (SEM) of the quadrata variation of a Triceratium favus, a valve of a square variety of a triangular centric diatom. Diatoms are single-celled photosynthetic algae, of which there are about 100,000 species. They have mineralized cell walls (frustules) that contain silica and provide protection and support. The diatoms form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: x1150.
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