Prediscosphaeraceae


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

Short diagnosis: 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 0-300Ma) 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:

Short diagnosis: 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): 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:

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.

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

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.

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

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.


Nannotax3 - Mesozoic - Prediscosphaeraceae by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2017

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