DescriptionCeratocystis perneri, a stylophoran echinoderm from the middle Cambrian.jpg
English: Specimen of Ceratocystis perneri, an echinoderm (basal Stylophora) from the Middle Cambrian sediments of Bohemia, Czech Republic. Below the Ceratocystis specimen there is a cephalon (head shield) of a trilobite. Photo taken at the National Museum, Prague.
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