Diatoms. Light micrograph of pennate diatoms, a group of single-celled algae. Pennate diatoms are symmetrical about a line. The other major type are centric diatoms, which are symmetrical around a single point. A characteristic feature of diatoms is their intricately patterned, glass- like cell wall, the frustule. The frustule consists of two halves which fit together like the lid and bottom of a box. Diatoms form an important part of the plankton in the marine and freshwater food chains. Magnification unknown.

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