Helicosphaera granulata

Helicopontosphaera granulata Bukry & Percival 1971

A helicolith characterised by a Type III (Helicosphaera carteri type) blanket, an expanded flange termination, and a central area adorned with permanent granulated structures. Helicosphaera granulata exhibits inclined extinction angles of about 50° on the blanket on the distal side and shows length-fast (−) elongation.

Black, M. 1971c. The systematics of coccoliths in relation to the paleontological record. In: Funnell, B. M. & Riedel, W. R. (eds), The Micropaleontology of the Oceans. Cambridge University Press, Cambridge pp. 611-624.

Bukry, D., Percival, S. F., 1971. New Tertiary calcareous nannofossils. Tulane Studies in Geology and Paleontology 8, 123-146.

Jafar, S. A., Martini, E., 1975, On the validity of the calcareous nannoplankton genus Helicosphaera. Senckenbergiana Lethaea 56, 381-397.

Kamptner, E., 1954. Untersuchungen über den Feinbau der Coccolithen. Archiv für Protistenkunde 100, 1-90.

Varol, O. 2025. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222

Wallich, G. C., 1877. Observations on the coccosphere. Annals and Magazine of Natural History 19, 342-350.