Pontosphaera versa

Discolithus versus Bramlette & Sullivan, 1961

Discolithina scissura Perch-Nielsen, 1971c

This species displays a weaker interference colour in the central area compared to the wall in the plan view, indicating the presence of a very thin distal cover over the non-porous proximal plate, as shown in the SEM image.

Bramlette, M. N. & Sullivan, F. R. 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2): 129-188.

Perch-Nielsen, K. 1971c. Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76.

Sherwood, R. W. 1974. Calcareous nannofossil systematics, palaeoecology and biostratigraphy of the Middle Eocene Weches Formation of Texas. Tulane Studies in Geology. 11: 1-79.