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Volume 23, issue 2 | Copyright
J. Micropalaeontol., 23, 127-132, 2004
https://doi.org/10.1144/jm.23.2.127
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Nov 2004

01 Nov 2004

Tetratropis terrina sp. nov., a new calcareous dinoflagellate cyst from the Upper Campanian polyplocum zone of Lägerdorf (NW Germany)

Katarzyna-Maria Bison1, Jens Wendler1, Gerard J. M. Versteegh2,3, and Helmut Willems1 Katarzyna-Maria Bison et al.
  • 1Division of Palaeontology, University of Bremen, FB 5, Geowissenschaften, Postfach 330440, D-28334 Bremen, Germany (e-mail: )
  • 2Netherlands Institute for Sea Research, PO Box 1790 AB Den Burg, Texel, Netherlands
  • 3University of Utrecht, Faculty of Earth Sciences, Budapestlaan 4, 3594 Utrecht, Netherlands

Abstract. A new calcareous dinoflagellate cyst species, Tetratropis terrina sp. nov., with an apparent stratigraphically narrow range is described from the Upper Campanian Bostrychoceras polyplocum zone of the Lägerdorf chalk sequence (NW Germany). The electron microscopic and light microscopic analyses show that T. terrina has both a pithonelloid wall type with uniformly inclined wall crystallites and a reduced peridiniacean paratabulation pattern. The prominent morphological similarities of T. terrina to the other two Tetratropis species (T. patina and T. corbula) justify the affiliation of the new species to the genus. As a result of the extension of the morphological spectrum by the new species, the genus Tetratropis Willems, 1990 has been emended.

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