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 on current and fossil coccolithophorids in ordinary and electron microscopy. 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.