Diatoms of the United States

The Diatoms of the US website is a diatom identification guide and ecological resource. It developed from ideas and format that began on the Antarctic Freshwater Diatom site. The site includes a visual key to the major groups of diatoms and to the genera.

Introduction to diatoms

An introduction to diatoms is available from the microfossil image recovery and circulation for learning website supported by University College London



McMurdo Dry Valleys Long-Term Ecological Research (MCM LTER)

MCM LTER is an interdisciplinary study of the aquatic and terrestrial ecosystems in a cold desert region of Antarctica. In 1992 the McMurdo Dry Valleys area was selected as a study site within the National Science Foundation's Long-term Ecological Research (LTER) Program.


Taxonomy & references

Index Nominum Algarum (INA)

The INA is a card file containing bibliographic references pertaining to algal taxonomy. It contains nearly 200,000 names of algae (in the broad sense) and is maintained by Paul Silva at the Herbarium of the University of California.


Diatom databases

ANSP Algae Image Database

This database contains light micrograph images of diatom taxa from rivers throughout the USA. The images were made primarily by ANSP Patrick Center Phycology Section staff as part of their routine analysis of algal samples.

California Academy of Sciences Names Project

The Hanna Database provides taxon, locality, and publication information for tens of thousands of samples from sites all over the world. The database also contains thousands of bibliographic references. It is portion of the California Academy of Sciences Diatom Collection.

Diatom Paleolimnology Data Cooperative

The DPDC is a database of diatom and associated ecological and paleolimnological data relevant to study of long-term trends in variables related to global change. It contains data from western hemisphere lakes, wetlands, or estuaries and includes regional surface-sample calibration sets, sediment cores, and other types of samples. It is supported by several groups including the Phycology Section, Patrick Center for Environmental Research and NOAA Paleoclimatology.