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Keywords: Evolutionary development of the pygidium of Glyptagnostus.png en Evolutionary development of the pygidium of Glyptagnostus 2012-11-20 23 06 50 Allison R Palmer 1962 Glyptagnostus and Associated Trilobites in the United States Geological Survey Professional paper 374-F United States Geological Survey US Department of the Interior United States Government Printing Office pl 2 Allison R Palmer PD-USGov-USGS PD-USGov Uploaded with UploadWizard Glyptagnostus Trilobite ygidium |