Discolithus fenestratus Deflandre & Fert, 1954
Clausibella Aubry in Aubry & Bord 2009
Elliptical placolith has a single cycle distal shield, a double-cycle proximal shield and a central area covered by a porous plate on the distal side. The tube cycle and proximal shield are birefringent in polarised light.
Clausicoccus differs from Coccolithus Schwarz (1894), Cruciplacolithus Hay & Mohler in Hay et al. (1967) and Sullivania Varol (1992) by having a porous plate in the central area. The species of Clausicoccus are identified based on the overall size, the arrangements of the pores in the number of the complete cycle of the rings, presence or absence of crossbars and the size of the central area.
Aubry, M. -P. & Bord, D., (2009): Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In, Koeberl, C. & Montanari, A. (eds) The Late Eocene Earth—Hothouse, Icehouse, and Impacts. - Geological Society of America, Special Papers. 452: 279-301.
Hay, W. W., Mohler, H. P., Roth, P. H., Schmidt, R. R. & Boudreaux, J. E., (1967): Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. - Transactions of the Gulf-Coast Association of Geological Societies. 17: 428-480.
Prins, B., (1979): Notes on nannology 1. Clausicoccus, a new genus of fossil Coccolithophorids. - INA Newsletter. 1: N2-N4.
Schwarz, E. H. L., (1894): Coccoliths. - Annals and Magazine of Natural History. 14: 341-346.
Varol, O., (1992): Sullivania a new genus of Palaeogene coccoliths. - Journal of Micropalaeontology. 11: 141-150.