Prediscosphaera


Classification: Mesozoic -> Podorhabdales -> Prediscosphaeraceae -> Prediscosphaera
Sister taxa: Petrarhabdus, Prediscosphaera,


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Circular Prediscophaera species

Elliptical Prediscophaera species with a diagonal cross

Elliptical Prediscophaera species with an axial cross

Specimens not identified to species level

Taxonomy:

Citation: Prediscosphaera Vekshina, 1959
Rank: Genus
Type species: Prediscosphaera cretacea (Arkhangelsky, 1912) Gartner, 1968.
Synonyms: Deflandrius Bramlette & Martini 1964
Notes & discussion: Species are reviewed in Perch-Nielsen (1979) and Perch-Nielsen (1985)

Farinacci & Howe catalog pages: Deflandrius + * Prediscosphaera *


Morphology remarks: Elliptical to circular placoliths with central area spanned by cross-bars which support tall, complexely-constructed spines. The distal shield is typically bicyclic, with a broad outer-cycle, generally constructed from 16 non-imbricating elements (V-units) and a narrow inner rim-cycle (R-units). The proximal shield is primarily formed from V-units but the R-units from a restricted cycle in the centre of the shield. The LM image is bicyclic, with the outer cycle dark and inner cycle bright.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Arkhangelsky, A.D., (1912). Upper Cretaceous deposits of east European Russia. Materialien zur Geologie Russlands, 25: 1-631.

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

Bramlette, M.N. & Martini, E., (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology, 10(2): 291-322.

Gartner, S., (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. The University of Kansas Paleontological Contributions, Article 48 (Protista 1): 1-56.

Perch-Nielsen, K., (1979). Calcareous nannofossils from the Cretaceous between the North Sea and the Mediterranean. Aspekte der Kreide Europas, IUGS Series A, 6: 223-272.

Perch-Nielsen, K., (1985). Mesozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 329-426.

Vekshina, V.N., (1959). Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Siberian Science Research Institute of Geology Geophysics Mineralogy and Raw Materials, 2: 56-81.


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Prediscosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-1-2018

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