Ocean 295622223Small

Black Lives Matter

Ocean 295622223Small

Black Lives Matter

Ocean 295622223Small

Black Lives Matter

Ocean 295622223Small

Black Lives Matter

Become a taxon contributor Learn more

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

Thalassiosira 16326 Mix 013

Taxon Contributors

Contributors produce comprehensive documentation on diatoms, leading to consistent and correct taxonomy.

Neidium Hitchcockii Sem Me 10011 042618 Mix 020Small

Taxa by Morphology

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

D Geminata

Editorial Review Board

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

What are Diatoms?

Diatoms

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


For practitioners

Taxon
Identification Guide

Genera

Genera

Classification information, citations, links and species listings for 164 genera completed to date.

Species

Species

Identification guides, original descriptions, citations, autecological information and more for 979 species and growing.

Contributors

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

We are expanding the number of webinars in the Diatom Web Academy during the pandemic. Most sessions (but not all) will be recorded and can be...

Encyonema Nicafei

Read More

WEBINAR: The genus Eunotia

The genus Eunotia Description: The diatom genus Eunotia Ehrenberg is diverse in freshwaters worldwide, especially acidic, dystrophic or...

Eunotia Cutout

Read More

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.

Logo Epa
Logo Usgs
Logo Instaar