Freshwater

• Cyanosite-Purdue University
  • The Cyanobacteria and Their Taxonomy (based on older Stanier 1977)
  • The Cyanobacteria and Their Taxonomy (based on newer Rippka et al. 1979)
• NSW Murray Regional Algal Coordinating Committee's Blue-green Algal Bloom Management Web Site
• UC Berkeley's Intro to the Cyanobacteria
   

Freshwater

• California Academy of Sciences Freshwater Diatom Database (Archives)
  • CAS Diatom Collection Hanna Database
  • Catalogue of Diatom Names, On-Line Version, (Updated 19 Sep 2011)
• Common Freshwater Diatoms of Britain and Ireland
• Diatom identification guide & ecological resource (University of CO @ Boulder)
  • About the Guide
  • What are Diatoms?
  • TAXA BY MORPHOLOGY
• DIA - Diatom Image Archive Homepage (University of Alberta)
• Great Lakes Diatoms, University of Michigan
• Great Lakes Waterlife Photo Gallery: Division Chrysophyta (Diatoms)
• Recent Diatoms Reported from the Central United States

Marine

• Census of Australian Marine Diatoms
• Diatom Flora of California's Salton Sea
• NOAA NODC Systematic Phytoplakton Search
  • Chlorophyta
  • Chrysophyta
  • Cryptophyta
  • Euglenophyta
  • Bacillariophyta
  • Dinophyta
  • Haptophyta
  • Prasinophyta

Mixed

• Klaus D. Kemp's Diatom Database (from the UK. Also, Click on Diatom Database on left side of page.)
• Diatoms of the Arid Southwest United States
• EDDI - European Diatom Database
• World of the Diatom, Eastern Kyoto University of the Arts, Biology Department (translation by Google)
• ZipCode Zoo Chlorophyta Homepage