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00925njm 22002777a 4500 dc Vieira, Manuel author Mahdi, Salih author Casas Gallego, Manuel author Fenton, Jim author 2018-11 Three dinoflagellate cysts species are formally described from Selandian and Danian sedimentary rocks of the North Sea and Norwegian Sea. The taxa are well known within the regional biostratigraphy community as important age markers, but have never been formally described. Thalassiphora lacunata sp. nov. differs from Thalassiphora delicata by possessing large, subcircular openings on the dorsal surface of the periphragm. For Spiniferites magnificus sp. nov., the morphology of the processes and the development of high sutural crests are the main diagnostic features to distinguish this species from other species of the genus Spiniferites. Operculodinium magnum sp. nov. differs from other Operculodinium species by its larger size and thicker wall, but also the distinctive numerous solid, fibrous processes. Spiniferites magnificus sp. nov. and O. magnum sp. nov. have a stratigraphic range restricted to the Danian. Thalassiphora lacunata sp. nov. has a short stratigraphic range mainly restricted to the early Selandian. Vieira, M., Mahdi, S., Casas-Gallego, M., & Fenton, J. (2018). Three new paleocene dinoflagellate cysts from the north sea and the norwegian sea. Review of Palaeobotany and Palynology, 258, 256-264. https://doi.org/10.1016/j.revpalbo.2018.09.002 0034-6667 10.1016/j.revpalbo.2018.09.002 https://hdl.handle.net/20.500.14352/126267 1879-0615 https://doi.org/10.1016/j.revpalbo.2018.09.002 https://www.sciencedirect.com/science/article/pii/S0034666718300307 Three new Paleocene dinoflagellate cysts from the North Sea and the Norwegian Sea