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=== Ligazóns externas ===
* [http://www.mala.bc.ca/~johnstoi/lamarck/tofc.htm Zoological Philosophy of J. B. Lamarck] {{Webarchive|url=https://web.archive.org/web/20070909093936/http://www.mala.bc.ca/~johnstoi/LAMARCK/tofc.htm |date=09 de setembro de 2007 }} {{En}}
* [http://sn2000.taxonomy.nl/Taxonomicon/TaxonTree.aspx?id=198696&tree=0.1&syn=1 Taxon: Subkingdom Radiata] {{Webarchive|url=https://web.archive.org/web/20090429005311/http://sn2000.taxonomy.nl/Taxonomicon/TaxonTree.aspx?id=198696&tree=0.1&syn=1 |date=29 de abril de 2009 }} {{En}}
* [http://www.findarticles.com/p/articles/mi_qa3746/is_199809/ai_n8812269 The development of radial and biradial symmetry: The evolution of bilaterality] {{En}}
* [http://www.sciencemag.org/cgi/content/abstract/304/5675/1335 Origins of Bilateral Symmetry: Hox and Dpp Expression in a Sea Anemone] {{En}}
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