![The First North American Occurrence of the Late Cretaceous Elasmobranch Ptychodus rugosus dixon with Comments on the Functional morphology of the Dentition and Dermal Denticles, 1982, Journal of Paleontology, 57 (2) : pages 403-409 with 2 plates and 1 fig]()
The First North American Occurrence of the Late Cretaceous Elasmobranch Ptychodus rugosus dixon with Comments on the Functional morphology of the Dentition and Dermal Denticles, 1982, Journal of Paleontology, 57 (2) : pages 403-409 with 2 plates and 1 fig
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