Members of the kingdom Bacillariophyta are the diatoms. They are unicellular organisms that have cell walls, or tests, that are made of silicon dioxide and composed of two valves, which fit together with the help of a set of girdle bands. Most are photosynthesizers and they are important members of the marine plankton. There are about 10,000 known species.
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- Great Lakes Diatoms Collection of images, classified by morphology and by genus.
- Introduction to Bacillariophyta (the Diatoms) Information about the fossil record, life history and ecology, systematics, and morphology.
- Diatoms Information on these ubiquitous organisms including their fossil record, classification, biology and life cycle with a number of images of individual species.
- Major Groups of Diatom Provides a facility for identifying diatoms based on their major morphological characteristics.
- Diatoms Article by Wim van Egmond introducing these delicate unicellular organisms that have yellow-brown chloroplasts that enables them to photosynthesize, with fine photographs.
- Diatom Display Small photograph gallery of these organisms.
- The Diatoms of Bitter Lake National Wildlife Refuge Photographic study by David B. Richman of the diatoms living in lakes in this high-gypsum environment.
- Diatoms in a Different Light Article by Roland Mortimer on these organisms, with a small image gallery of different freshwater species.
- Diatomées des Eaux Douces Photographs and descriptions of fresh water diatoms and fossil diatoms. French and English.
- Diatoms Student project including classification, habitat, adaptation, nutrition, reproduction and interactions with other species.
- Cohn Lab Center For Diatom Research Dedicated to expanding research and general knowledge of diatoms, includes basic introductions about diatoms, and information about the laboratory and the research undertaken.