Coccolithus cf. miopelagicus Bukry, 1971b
Large (13.0-14.0µm), elliptical species of Coccolithus Schwarz (1894) have a central opening without any central structure. This morphotype has the highest occurrence in Tortonian but re-appears again in the Pleistocene sediments.
Bukry, D., 1971b. Cenozoic calcareous nannofossils from the Pacific Ocean. - San Diego Society of Natural History Transactions 16, 303-327.
Schwarz, E. H. L., 1894. Coccoliths. Annals and Magazine of Natural History 14, 341-346.