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The Hemichordata are a phylum of Deuterostomia. Fossil representatives are known since the Cambrian. An important extinct group within the Hemichordata, are the Graptolithina or graptolites. Still living members today are for example the acorn worms. They are widely distributed in marine Paleozoic deposits. Graptolites are excellent index fossils.
Photos or locations for Hemichordata on this site
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