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Abstract
The Late Cretaceous organic-walled dinoflagellate cyst species Microdinium? sincfalensis Louwye 1997 and Invertocysta flandriensis Louwye 1997 are considered to be junior synonyms of Membranigonyaulax wilsonii Slimani 1994 and Turnhosphaera hypoflata (Yun 1981) Slimani 1994, respectively.
Acknowledgements
The authors thank the Research Unit Palaeontology, Ghent University, Belgium for technical support andthe University Mohammed V-Agdal (project SVT 11/09) and the National Center of Scientific Research (CNRST) (URAC46), Morocco for financial support. The constructive comments by James B. Riding, Claus Heilmann-Clausen and an anonymous reviewer improved the manuscript considerably; their remarks are much appreciated.