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Fossil dinoflagellate cysts assigned to Scriniodinium campanula Gocht and S. dictyotum Cookson and Eisenack were recovered from Mesozoic sediments of the western North Atlantic. New evidence of cyst tabulation and relationship of the two wall layers is proposed. Morphological gradation between these two morphotypes, in sediments of early Neocomian age, suggests that they are morphogenetically related.
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