Prediscosphaeraceae


Classification: Mesozoic -> Podorhabdales -> Prediscosphaeraceae
Sister taxa: Axopodorhabdaceae, Biscutaceae, Calyculaceae, Cretarhabdaceae, Mazaganellaceae, Prediscosphaeraceae, Tubodiscaceae,

Distinguishing features: Regular placoliths; central area spanned by cross-bars supporting a tall, complexely-constructed spine.
The distal shield and proximal shield constructed from 16 large non-imbricating elements (V-units); R-units form restricted cycle on proximal shield and inner tube cycle, giving bicyclic LM image with bright inner cycle.


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Prediscosphaera with massive, blocky spine covering most of the distal surface.



Taxonomy:

Citation: Prediscosphaeraceae Rood et al., 1971
Rank: Family
Type species: Prediscosphaera Vekshina, 1959.
Synonyms: Deflandriaceae Black 1968. Deflandrius is a junior synonym of Prediscosphaera hence the name Prediscosphaeraecea is used. In some online databases it is suggested that the family Deflandriaceae is a senior synonym of the Papposphaeraceae. This is based on the suggestion of Norris (1983) that the extant genus Papposphaera resembles fossil Prediscosphaera - however the similarities are superficial and the two groups have quite different rim structures and are most unlikely to be directly related (Jordan & Young 1990).

Farinacci & Howe catalog pages: Prediscosphaeraceae [no catalog entry yet]

Distinguishing features: Regular placoliths; central area spanned by cross-bars supporting a tall, complexely-constructed spine.
The distal shield and proximal shield constructed from 16 large non-imbricating elements (V-units); R-units form restricted cycle on proximal shield and inner tube cycle, giving bicyclic LM image with bright inner cycle.

Geological Range:
Notes: Common components of Upper Cretaceous assemblages.
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

Plot of occurrence data:

References:

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

Jordan, R. W. & Young, J. R. (1990). Proposed changes to the classification system of living Coccolithophorids. INA Newsletter. 12(1): 15-18. gs

Norris, R. E. (1983). The family position of Papposphaera Tangen and Pappomonas Manton & Oates (Prymnesiophyceae) with records from the Indian Ocean. Phycologia. 22(2): 161-169. gs

Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gs

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. gs


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Prediscosphaeraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10945 Go to Archive.is to create a permanent copy of this page - citation notes



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