University of Michigan
University of Michigan: Great Lakes Diatoms
Major groups of diatoms listed. Also genera list. A comprehensive site on diatoms.
University of California
Ucmp: Diatoms
Fossil records of diatoms. History, ecology, systematics, and morphology.
Microscopy UK
Microscopy Uk: Diatoms
Definition of diatoms, habitat, pictures, marine diatoms, and various species of diatoms.
