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Life on our beautiful planet earth: Coscinodiscus, external view

Life on our beautiful planet earth: Coscinodiscus, internal view

Life on our beautiful planet earth: Coscinodiscus, internal view within silicious bilayer

Life on our beautiful planet earth: Plankton bloom in the Chukchi Sea

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Diatoms are single-celled algae that live nearly everywhere there is water - streams, ponds, lakes, oceans, and even soils.

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Identification Guide


Classification information, citations, links and species listings for 168 genera completed to date.


Identification guides, original descriptions, citations, autecological information and more for 1020 species and growing.

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This project depends on many people to document the diverse diatom flora of streams, rivers, wetlands, lakes, springs, soils, estuaries and coastal zones.

Recent News & Projects

Diatom Web Academy 2022

The Diatom Web Academy continues... Sessions are recorded and can be accessed for later viewing. You are invited to join us, wherever you may be,...

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14th European Diatom Meeting

Lake Ohrid is a deep and ancient lake of tectonic origin that has existed for several million years. It is the home of many endemic species of...

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Diatoms of North America has been developed in part with the generous funding and support of US EPA, USGS, the Institute of Arctic and Alpine Research at University of Colorado Boulder and other organizations.