Sources:

-Nova Southeastern University - http://www.nova.edu
-Scripps Institution of Oceanography - http://echinotol.org/ophiuroidea
-The Echinoblog - http://echinoblog.blogspot.com
-The Variety of Life, Collin Tudge, 2000
-The Virtual Fossil Museum - http://www.fossilmuseum.net
-The Tree of Life Project - http://tolweb.org
-Wikipedia - http://en.wikipedia.org

Citation: García, A.I. 2015. The Tree Of Nature (Online) at http://thetreeofnature.com

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