Coronocyclus baileyi

Coronocyclus baileyi da Gama & Varol, 2013

Coronocyclus mesostenos de Kaenel & Boesiger in Boesiger et al., 2017

Elliptical species of Coronocyclus Hay Mohler & Wade (1966) have a narrow pelaga and a wide central opening without 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 baileyi differs from Coronocyclus latus (da Gama & Varol 2013) Varol, emend. and Coronocyclus prionion (Deflandre & Fert, 1954) Stradner in Stradner & Edwards (1968) by being elliptical rather than circular.

Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A., (2017): Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. - Journal of Nannoplankton Research. 37(2-3): 145-175.

da Gama, R. O. B. P. & Varol, O., (2013): New Late Oligocene to Miocene Species. - Journal of Nannoplankton Research. 33(1): 1-12.

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.

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.