Coronocyclus latus

Coronocyclus nitescens ssp. latus da Gama & Varol, 2013

Circular species of Coronocyclus Hay Mohler & Wade (1966) having a wide 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 latus (da Gama & Varol, 2013) Varol, emend. differs from Coronocyclus prionion (Deflandre & Fert, 1954) Stradner in Stradner & Edwards (1968) by having a pelaga greater than 2.0µm in width. It distinguished from Coronocyclus baileyi by being circular rather than elliptical.

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.