Abstract
Culture experiments on dinoflagellates from the Atlantic Ocean revealedScrippsiella regalis(Gaarder) Janofske, nov. comb., a calciodinelloid species with a spherical spiny calcareous cyst. This calcareous cyst was collected previously from plankton and sediment samples, where it was described as the coccolithophoridDiscosphaera regalisGaarder or was often mistaken for the cyst ofScrippsiella trochoidea(von Stein) Loeblich III. The morphological features of both the cellulosic theca and the calcareous cyst ofS. trochoideaandS. regaliswere compared with respect to their systematic position and the emendation of taxa. Both species were found to have different distribution patterns.Scrippsiella trochoideais known only from the neritic environment, whereasS. regalishas been found mostly in oceanic samples. The preservation of these spiny calcareous dinocysts in the (fossil) sediment was dependent on the ultrastructure of the calcareous layer of the cyst wall.
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