Cribrocentrum artuziae

Cyclicargolithus artuziae Varol, 1989

Diameter: 5.0µm

Small (<5.0µm) circular species of Cribrocentrum having a central area with birefringent permanent central mesh

Heliolithus helianthus Hay & Towe, 1962 looks artificially similar but has two cycled proximal shields; therefore, recombined to Toweius helianthus by Hay & Mohler, 1967.

The detailed structure of Discolithus oculus-electrae is not resolvable. It may be circular Cribricentrum or equally circular Toweius species.

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., 1967, Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. Journal of Paleontology 41(6), 1505-1541.

Hay, W. W., Towe, K. M., 1962a. Electron microscope examination of some coccoliths from Donzacq (France). Eclogae Geologicae Helvetiae 55, 497-517.

Varol, O., 1989b. Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología 21, 273-320.