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• The Diatom Home Page – hosted by Roger Sweets (Indiana Univeristy). Information of general interest to diatomists and other phycologists. Includes info on how to subscribe to the Diatom-L, the forum for discussion of all matters diatomaceous or siliceous.
• The International Society for Diatom Research – a source of information about the Society, its ideals, events, history and membership.
• The California Academy of Sciences, Diatom Collection – an ongoing project to present taxonomic information, images, records of collections, and references pertaining to diatoms.
• Stunning diatom images – hosted by accomplished Dutch photomicrographer Wim van Egmond who specialises in microscopy of small water-borne creatures using a variety of advanced contrast-enhancing techniques. Some of the best diatom images you’ll ever see! Have a look around the rest of his site for some other surprises!
• Useful software – hosted by Steve Juggins (Newcastle). Software for a wide range of uses in Environmental and Earth Sciences.
• Diatoms.co.uk – hosted by Klaus Kemp (Microlife Services), specialist in diatom microslides and diatom arrangements. Incredible artistry, incredible patience, an incredibly steady hand! Don’t miss this one! Check out our favourite – the Christmas trees!

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• Marine Diatom Index – hosted by Ivo Grigorov (SOC). A virtual photo library for marine diatoms, including descriptions ecology & distributional information, reference lists and links to complementary sites.
• Chaetoceros and Bacteriastrium – hosted by Jan Rines (Rhode Island).
• Diatoms-Nature’s Gems – hosted by Hans Schrader (Bergen). Information on all things diatom.
• In the news:
  • The Thalassiosira pseudonana (marine diatom) genome help can tell us why diatoms are so successful in marine environments
  • The rise of Rhizosolenid diatoms

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• The Paleolimnology Home Page – hosted by Roger Sweets (Indiana Univeristy). Information for those interested in and/or practicing paleolimnology.
• The Algal Image Laboratory at BGSU – 185+ digitised images of mostly freshwater diatoms. Contains links to both marine and freshwater diatom resources.
• European Diatom Database (EDDI) – at University College London and Newcastle University. A web-based system of diatom training sets, ecological and taxonomic information, diatom images and transfer functions for performing environmental reconstructions from fossil assemblages.
• ADIAC: Automatic Diatom Identification and Classification – hosted by the Royal Botanic Garden Edinburgh and University of Algarve. A pilot study concerning the application of image processing and pattern recognition tools to the automisation of diatom identification by computer processing.

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• Radiolaria.org
  – an online database containing information about radiolarians – fossil and recent, with images, descriptions, references, synonyms and links to other online resources. Includes PDF downloads of ‘Radiolaria’ the newsletter of the International Association of Radiolarian Paleontologists.
• Interrad – International Association of Radiolarian Paleontologists. Includes information on membership and meetings.
• The Rad Page – hosted by Fabrice Cordey (Lyon). Information about Radiolarians, their occurrences and techniques for their study.
• Rad World – hosted by Catherine Nigrini, Jean Pierre Caulet & Annika Sanfilippo. A relational database designed to provide information about the taxonomy, and geographical and stratigraphical distribution of all described genera and species of Radiolaria from the Paleozoic through the Cenozoic.

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