Laboratory modules using sea urchin eggs to explore fertilization and development.

Information about sea urchins, such as how they live, feed, and reproduce. There is also an alphabetic listing of their taxa. From The Natural History Museum, London.

Overview of the systematics and ecology of starfish, brittle stars, sea cucumbers, sea urchins, and sand dollars.

Starfish tales and science by Jonathan Dale.

Photos and a brief description of starfish characteristics.

A brief description of the phylum followed by a long list of annotated photographs.

Describes the taxonomic groupings and provides links to images of some taxa.

Characteristics and phylogeny of the spiny-skinned animals: sea urchins, starfish, and their allies.

Echinoderm links.

Some characteristics of the phylum that includes starfish, sea cucumbers, sea urchins, crinoids and brittle stars.