Nannotax3 - ntax_mesozoic - Prediscosphaera

Citation: Prediscosphaera Vekshina, 1959

Type species: Prediscosphaera cretacea (Arkhangelsky, 1912) Gartner, 1968.

Synonyms: Deflandrius Bramlette & Martini 1964

Taxonomic discussion: Species are reviewed in Perch-Nielsen (1979) and Perch-Nielsen (1985)

Morphology: 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): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Aptian Stage (0% up, 126.3Ma, in Aptian stage). Data source: Total of range of species in this database

References:

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

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

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

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

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

Perch-Nielsen, K. (1985b). Mesozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 329-426. gs

Vekshina, V. N. (1959). Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Trudyi Instituta Geologii i Geogiziki, Sibiriskoe Otlodelenie, Akademiya Nauk SSSR (Nauka) Moscow. 2: 56-81. gs

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	P. columnata group Circular Prediscophaera species	P. columnata P. ponticula
	P. cretacea group Elliptical Prediscophaera species with a diagonal cross	P. cretacea P. desiderograndis P. grandis P. majungae P. microrhabdulina P. serrata
	P. spinosa group Elliptical Prediscophaera species with an axial cross	P. arkhangelskyi P. borealensis P. bukryi P. incohatus P. mgayae P. rhombica P. spinosa P. stoveri
	Prediscosphaera sp. Specimens not identified to species level

Tags	LITHS: placolith, ca_disjunct,
Metrics	Lith size: 0->0µm; Segments: 16->16; Data source notes: size range of included species

Prediscosphaera

References:

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