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Diatoms of North America

Diatoms of North America

Diatoms of North America

Diatoms of North America

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

Taxa by Morphology

New to diatoms? Jump into diatom identification using the visual key.

Editorial Review Board

Using diatoms in assessment? Specify the use of Diatoms of North America in contracts and task agreements.

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.


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

Recent News & Projects

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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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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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.