Work cited

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Denning, David, Russell, Eric R. "Branches of the Tree of Life: Echinoderms". BioMedia
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"Phylum Echinodermata". Invertebrates. <http://www.cyhaus.com/marine/Echinoderm.htm>.

"Phylum Echinoderm". Starfish. <http://www.virted.org/Animals/Starfish.html>.

"What are the Echinodermata". The Diversity of Living Organisms: Themes of Adaptation
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<http://science.kennesaw.edu/biophys/biodiversity/animalia/echinoderm.html>.

Zubi, Teresa. "Echinoderms". Invertebrates. 2007.
<http://www.starfish.ch/reef/echinoderms.html>.