3 links
Echinoderms
starfish.ch
Descriptions of the major species of Echinodermata (starfish, brittle star, sea urchin, feather star, sea cucumber) with illustrations and links to photos.
Introduction to the Echinodermata
ucmp.berkeley.edu
Overview of the systematics and ecology of starfish, brittle stars, sea cucumbers, sea urchins, and sand dollars.
Sea and Sky: Echinoderms
seasky.org
A brief description of the phylum followed by a long list of annotated photographs.
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