what is an echinoderm

brittle star crinoid sea cucumber
Brittle Star; photo by Dan Hershman cc-by Sea Lily; photo by NOAA cc-by Sea Cucumber; photo by US Mision Canada cc-by

 

Sources:

-The Tree of Life - www.tolweb.org:
-The Variety of Life, Colin Tudge, 2000

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

 

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