Diatom identification guide & ecological resource

for water resource managers, ecologists, taxonomists, analysts, systematists, students, and the public.

We aim to provide everyone with accurate information about diatoms of the United States.

Expert contributors are submitting text and images for freshwater genera and North American species, including taxonomic and ecological information.

Diatom "visual guides" are included for all taxa.  The guides illustrate key traits that distinguish a taxon (examples to the right). For many species, environmental response plots and geographic distribution maps are also included.

Our editorial review board is prioritizing taxa for treatment in species pages and ensuring the scientific merit of each submission.

See any issues with content or functionality? If so,  please let us know

Cymbella turgidula


157 Completed
22 Underway
863 Completed
196 Underway
1059 TOTAL

Getting Started

About this website

What are diatoms?

Identify your taxa

Special News

26 June, 2015

Editorial Review Guidelines

25 March, 2011

Information for contributors


07 August, 2017

North American Diatom Symposium 2017

04 August, 2017

Beer and Diatoms: The perfect mix

More news...


Southeast Stream Quality Assessment

Ecology and Systematics of Diatoms course, 2014

College Prep Diatoms 2017

More projects...