Nannotax3 - ntax_mesozoic - Prediscosphaera

Prediscosphaera


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


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

Taxonomy:

Citation: Prediscosphaera Vekshina, 1959
Rank: Genus
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)

Farinacci & Howe catalog pages: Prediscosphaera * , Deflandrius + *


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.

Search data:
TagsLITHS: placolith, ca_disjunct,
MetricsLith size: 0->0µm; Segments: 16->16;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian 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

Plot of occurrence data:

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. In, Weidmann, J. (ed.) Aspekte der Kreide Europas. International Union of Geological Sciences Series A. 6: 223-272. gs V O

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


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Prediscosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-1-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10928 Go to Archive.is to create a permanent copy of this page - citation notes



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