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Each day in November, an image of a genus will appear on this banner page.

What is the name of this genus? Check back tomorrow for the answer

Yesterday's genus - Coscinodiscus

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Diatoms of North America is a collaborative work in progress, growing and changing as science advances.

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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 166 genera completed to date.


Identification guides, original descriptions, citations, autecological information and more for 1017 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.

Recent News & Projects

Diatom Web Academy 2021

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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Where can I buy diatoms?

Living diatom cells can be isolated from their surrounding assemblage of cells and in kept alive in cultures. Culture collections have staff that do...

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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.