Sources:

-The Tree of Life - www.tolweb.org
-The Variety of Life, Colin Tudge, 2000
-University of California Museum of Paleontology – www.ucmp.berkeley.edu
-Encyclopedia of Life – www.eol.org
-The Earth Life Web – www.earthlife.net
-Onychophora website – www.onychophora.com
-Wikipedia – www.en.wikipedia.org

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

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