Tree of Life Project
Tree of Life Web Project: Flagellates
Very good, in-depth overview of flagellates. Includes a chart listing all the groups of flagellates.
Other
Universite De Montreal: Protist Picture Gallery
At this site from the Universite de Montreal, you can click on the name or picture to see images & data on each of the protozoa. Elementary teachers will need to guide their students through this information.