Diatom identification guide & ecological resource

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

UPDATE

The Diatoms of the United States website was down for maintenance at the end of Saturday, January 23, 2016.

Please let us know if you notice any unusual content or site behavior. 

Neidium undulatum

Lemnicola

GENERA
153 Completed
20 Underway
173 TOTAL
SPECIES
723 Completed
181 Underway
904 TOTAL

Getting Started

About this website

What are diatoms?

Identify your taxa


Special News

25 March, 2011

Information for contributors


News

17 November, 2015

Ruth Patrick: The River Doctor

16 November, 2015

Developing a species complex, I mean, species concept

More news...


Projects

Diatoms from remote places

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

Renovation and computerization of ANSP Diatom Herbarium

More projects...