California Academy of Sciences Diatom Collection: An extensive resource on diatom taxonomy, primarily focused on recent freshwater diatoms of the United States.
Chesapeake and Coastal Bay Life - Diatoms: Fact sheets on the diatom genera and species found in Maryland in Chesapeake Bay and its tributaries.
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.
Freshwater Diatoms: Microscope images of many genera, mostly collected in central Texas.
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.