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

Encyonema norvegicum


155 Completed
18 Underway
758 Completed
171 Underway

Getting Started

About this website

What are diatoms?

Identify your taxa

Special News

25 March, 2011

Information for contributors


15 April, 2016

Track new content on DOTUS

01 April, 2016

International Diatom Symposium Workshops

More news...


Diatoms of North-Central Pennsylvania

Ecology and Systematics of Diatoms course, 2011

Diatoms from remote places

More projects...