Coronocyclus prionion

Cyclolithus prionion Deflandre & Fert, 1954

Umbilicosphaera nitescens Kamptner, 1963

Coronocyclus nitescens (Kamptner, 1963) Bramlette and Wilcoxon, 1967

Coronocyclus serratus Hay, Mohler & Wade, 1966

Cyclococcolithus marginatus Jerkovic, 1971

Circular species of Coronocyclus having a narrow pelaga [<2.0µm] and a wide central opening without any structure. The tube cycle bears spines. The proximal shield is made up of strongly imbricated chevron-like segments. The entire species is strongly birefringent in polarised light.

Coronocyclus prionion differs from Coronocyclus latus (da Gama & Varol, 2013) Varol emend. by having a pelaga less than 2.0µm in width. It distinguished from Coronocyclus baileyi da Gama & Varol (2013) by being circular rather than elliptical.

Bramlette, M. N. & Wilcoxon, J. A., (1967b): Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. - Tulane Studies in Geology and Paleontology. 5: 93-131.

Deflandre, G. & Fert, C., (1954): Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. - Annales de Paléontologie. 40: 115-176.

Hay, W. W., Mohler, H. P. & Wade, M. E., (1966): Calcareous nannofossils from Nal'chik (northwest Caucasus). - Eclogae Geologicae Helvetiae. 59: 379-399.

Jerkovic, L., (1971b): Cyclococcolithus marginatus nov. sp. des coccolithophorides du Tortonien moyen des environs de Prijedor (Yougoslavie). - Bulletin Scientifique, Yougoslavie. A16: 204-.

Kamptner, E., (1963): Coccolithineen-Skelettreste aus Tiefseeablagerungen des Pazifischen Ozeans. - Annalen des Naturhistorischen Museums in Wien. 66: 139-204.

Stradner, H. & Edwards, A. R., (1968): Electron microscopic studies on Upper Eocene coccoliths from the Oamaru Diatomite, New Zealand. - Jahrbuch der Geologischen Bundesanstalt. 13(66): 1-48.