RT Journal Article T1 Three new Paleocene dinoflagellate cysts from the North Sea and the Norwegian Sea A1 Vieira, Manuel A1 Mahdi, Salih A1 Casas Gallego, Manuel A1 Fenton, Jim AB 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. PB Elsevier SN 0034-6667 YR 2018 FD 2018-11 LK https://hdl.handle.net/20.500.14352/126267 UL https://hdl.handle.net/20.500.14352/126267 LA eng NO 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 DS Docta Complutense RD 30 dic 2025