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What are Diatoms?

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

For practitioners

Identification Guide


Classification information, citations, links and species listings for 165 genera completed to date.

Guide to genera
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Identification guides, original descriptions, citations, autecological information and more for 1007 species and growing.

We encourage new contributors to submit taxon pages.

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

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WEBINAR: Keeled diatoms

Description: Keeled diatoms refer to a broad, informal morphological group of taxa with raphes in a canal often raised on a keel. But what is a keel?...

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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.