This page will offer images, keys, and a variety of collection, literature and distribution information to facilitate our understanding of freshwater diatom biodiversity, systematics, and evolution. Below is a list of the freshwater diatom genera. Each name is linked to a description of the genus and images taken with the light microcope. Two examples, Gomphoneis and Actinella, contain more information with links to collections in the California Academy of Sciences, references, nomenclature, and scanning electronmicrographs, and exsiccatae.

Throughout these pages there are six digit numbers enclosed by square parentheses. These numbers identify publications in the Diatom Publication Database. Currently, these numbers are not linked to the database. The publication can be found by typing in the publication numbers in the Diatom Publication Database on the main diatom page.