«Ctenochelys stenoporus» (Hay, 1905) (Testudines: Toxochelyidae) and «Clidastes» SP. (Squamata: Mosasauridae) from the Upper Cretaceous of NW-Germany

  • Hans-Volker Karl
    University of Göttingen hvkarl[at]web.de
  • Christian J. Nyhuis
    Universität zu Köln
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