Pontosphaera versa
(Bramlette & Sullivan, 1961)
Sherwood, 1974
Jun 13, 2025
Set number: 1898
-
1
10µm
Final Epithet
Pontosphaera versa (Bramlette & Sullivan, 1961)
Sherwood, 1974
Basionym
Discolithus versus Bramlette & Sullivan, 1961
Remarks
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.
References
Bramlette, M. N. & Sullivan, F. R. 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2): 129-188.
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.