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canvas prints ernst haeckel canvas prints nature canvas prints diatom canvas prints alga canvas prints algae canvas prints algal canvas prints eukaryotic canvas prints phytoplankton canvas prints diatomaceous canvas prints bacillariophyta canvas prints bacillariophyceae canvas prints unicellular canvas prints silica canvas prints frustule canvas prints heterokont canvas prints

photographs ernst haeckel photos nature photos diatom photos alga photos algae photos algal photos eukaryotic photos phytoplankton photos diatomaceous photos bacillariophyta photos bacillariophyceae photos unicellular photos silica photos frustule photos heterokont photos

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Diatoms. Computer-enhanced engraving of assorted species of diatom. Diatoms are a group of single-celled algae. The two main morphological types of diatom are represented here pennate (rod-shaped) and centric (rounded). A characteristic feature of diatoms is their intricately patterned, glass-like cell wall, or frustule. The frustule consists of two halves which fit together like the lid and bottom of a box. It is often decorated with rows of tiny holes, known as striae. Diatoms form an important part of the floating plankton in the marine and freshwater food chains. Engraving taken from Ernst Haeckel's famous treatise 'Art Forms of Nature' (1904).