Abstract
Two new species of deflandreoid dinoflagellate cysts are described from the Coniacian and Campanian from the 6406/3–6 well, Tyrihans Field in the Norwegian Sea. Chatangiella islae sp. nov. possesses spines that are uniquely restricted to the cingulum, while Trithyrodinium zakkii sp. nov. is distinguished from other species of the genus by spines arising from the endophragm. These species have been known under various informal (and invalid) names and are very important biostratigraphic markers in the North, and Norwegian–Greenland seas.
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