Nannotax3 - ntax_mesozoic - Prediscosphaeraceae

Prediscosphaeraceae


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

Distinguishing features:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: 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 (time control age-window is: 0-800Ma)Granddaughter taxa
Petrarhabdus
Prediscosphaera with massive, blocky spine covering most of the distal surface.
P. copulatus
P. kirenii
P. vietus
P. sp.

Prediscosphaera

P. columnata group
P. cretacea group
P. spinosa group
P. sp.

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:
Parent taxon (Podorhabdales): Placolith (or modified placolith) coccoliths showing little or no imbrication. Typically, V-units form distal shield, R-units form proximal shield.
This taxon: 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.

Search data:
TagsLITHS: placolith, ca_disjunct,
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

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

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 V O

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 V O

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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Prediscosphaeraceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2021

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Short stable page link: https://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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