University of California
Ucmp: From Starfish to Sea Cucumbers
A comprehensive site that looks at the different types of echinoderms, their life history and anatomy.
California Academy of Sciences
California Academy of Sciences: Echinoderm Webpage
Resource provides a brief overview of echinoderms. Includes pictures and links for more information.
Yale University
Yale New Haven Teachers Institute: Animal Kingdom
Background information about all of the classes of the animal kingdom, followed by four short lesson plan outlines.