Helicosphaera granulata

Helicopontosphaera granulata Bukry & Percival 1971

Helicolith having a Type III (Helicosphaera carteri type) blanket, expanded flange termination and a granulated central area.

Helicosphaera granulata differs from Helicosphaera burkei Black (1971) and Helicosphaera carteri (Wallich, 1877) Kamptner, (1954) by having a granulated central area. Helicosphaera carteri has two pores whilst Helicosphaera burkei has an axial suture in the central area.

Black, M., (1971): 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 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. Anzeiger. - Österreichische Akademie der Wissenschaften. Mathematische-Naturwissenschafliche Klasse. Wien. 87: 152-158.

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