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Caloneis freshwater diatom, light micrograph
Differential interference contrast (DIC) light micrograph of the freshwater diatom Caloneis sp. Caloneis belongs to the pennate diatoms (penna: Latin for feather). The single cells contain wall-bound chloroplasts whose brown colour is caused by the dye fucoxanthin. Here the cell is seen in shell view. The focus is on the outside of the shell with the longitudinal raphe and the fine transverse stripes on the outside of the cell. Magnification: x600 at a print width of 10 centimetres., by GERD GUENTHER/SCIENCE PHOTO LIBRARY
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