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

Fragilariforma bicapitata

Cosmioneis

GENERA
157 Completed
22 Underway
179 TOTAL
SPECIES
862 Completed
197 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


News

07 August, 2017

North American Diatom Symposium 2017

04 August, 2017

Beer and Diatoms: The perfect mix

More news...


Projects

Algal biodiversity in Great Smoky Mountains National Park

U.S. Geological Survey / Academy of Natural Sciences of Philadelphia

Ecology and Systematics of Diatoms course, 2012

More projects...