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Our current studies of the exoskeletal structures and ultrastructures in Lower Devonian dalmanitid trilobites of the Prague Basin are briefly described and discussed. The interior of the exoskeleton in most specimens from the Prague Basin is recrystallised and largely filled with very fine homogeneous sparitic cement. The ultrastructures sensu stricto, e.g., the lamination, layers forming the exoskeleton, and the fine pores or "Osmólska" cavities, are mostly imperceptible even at higherdoi:10.3140/bull.geosci.2007.01.27 fatcat:fqxbxn45yveqvn4q34wq44fzse