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== Nexus externi ==
{{Fontes biologici}}
* [http://taxonomicon.taxonomy.nl/TaxonTree.aspx?id=198706 Deuterostomia at Systema Natura]
* [http://www.ucmp.berkeley.edu/phyla/deuterostomia.html Deuterostomia at Univ Berkeley]
* [http://animaldiversity.ummz.umich.edu/site/accounts/classification/Deuterostomia.html#Deuterostomia Deuterostomia at Animaldiversityweb]