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. Species of the fusiform peridiniacean dinoflagellate cystgenera Svalbardella Manum, 1960, emend. (Eocene–Oligocene) and Palaeocystodinium Alberti, 1961(Late Cretaceous–Miocene), have been examined from the high to middlelatitudes of the Northern Hemisphere: Spitsbergen, Norwegian-Greenland Sea,Labrador Sea, western North Atlantic, and the North Sea basin. The genusSvalbardella is emended to comprise species with smooth or finely ornamented surfacesand for which one or both horns are bluntly rounded. Svalbardella clausii sp. nov. has a narrowrange restricted to the lowermost Chattian (close to the NP24–NP25 boundaryand within Chron C9n), and it therefore appears a useful stratigraphicalmarker. This species has a wide distribution across the North Atlantic,having been reported from the North Sea basin, western North Atlantic, andthe Labrador Sea. Svalbardella clausii sp. nov. overlaps stratigraphically with the reoccurrenceinterval of Svalbardella cooksoniae Manum, 1960, and spans the Oi-2b cooling maximum. Its presencemay therefore be related to the establishment of cooler surface waters atthis time. Svalbardella kareniae sp. nov. has a discordant occurrence: Lower Oligocene and LowerMiocene of the Norwegian Sea at Deep Sea Drilling Project Site 338 and OceanDrilling Program Site 643, respectively, and mid-Oligocene of the North Sea.Its distribution suggests that Svalbardella kareniae sp. nov. favours more open marineconditions. Palaeocystodinium obesum Fensome et al., 2009, described from offshore eastern Canadawhere it has a highest occurrence in the Lower Oligocene, is emended toinclude specimens with a finely ornamented periphragm and traces oftabulation in addition to the archeopyle.

journal of micropalaeontology

New species of the dinoflagellate cyst genus &amp;lt;i&amp;gt;Svalbardella&amp;lt;/i&amp;gt; Manum, 1960, emend. from the Paleogene and Neogene of the northern high to middle latitudes