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Abstract. A new species of dinoflagellate cyst, Desmocysta hadra sp. nov., is described from the earlyCampanian (Late Cretaceous) in the Norwegian Sea. This new taxon differsfrom the other three known species by its particularly robust but highlyfolded wall and the short, fine filaments arising from the antapex. Theshort stratigraphic range of early Campanian for this new species wascalibrated with other regional well-dated dinoflagellate cysts, making it agood biostratigraphic marker. A review of the taxonomic description of thegenus has also been undertaken using the available published data. Theavailable data shows a consistent presence of Desmocysta in the fossil record from theEarly Cretaceous to the late Paleocene, although some Late Jurassicoccurrences have been reported in the North Sea Basin. The current recordsalso indicate that this genus is restricted to higher latitudes in theNorthern Hemisphere. Based on Paleocene and Late Cretaceous occurrences ofthe genus, and its association with dinoflagellate cysts, prasinophytes andacritarchs, a proximal, highly stressed marine environment for Desmocysta issuggested.

journal of micropalaeontology

&amp;lt;i&amp;gt;Desmocysta hadra&amp;lt;/i&amp;gt;, a new Late Cretaceous dinoflagellate cyst species: stratigraphic range, palaeogeographic distribution and palaeoecology