3 links
Cohn Lab Center For Diatom Research
condor.depaul.edu
Dedicated to expanding research and general knowledge of diatoms, includes basic introductions about diatoms, and information about the laboratory and the research undertaken.
Introduction to Bacillariophyta (the Diatoms)
ucmp.berkeley.edu
Information about the fossil record, life history and ecology, systematics, and morphology.