Braarudosphaera regularis


Classification: Mesozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Braarudosphaera -> Braarudosphaera regularis
Sister taxa: B. amputans, B. batilliformis, B. bigelowii, B. pseudobatilliformis, B. turbinea, B. wendlerae, B. stenorhetha, B. africana, B. hockwoldensis, B. primula, B. regularis, B. quinquecostata, B. sp.,

Distinguishing features: Braarudosphaera with pentagonal outline and bilateral symmetry, i.e. the sutures bisect the edges.


Taxonomy:

Citation: Braarudosphaera regularis Black, 1973
Rank: Species
Notes & discussion: According to Lambert (1986) this is not a real species but a preservational variant of B. africana produced by breakage of elevated B. africana specimens, leaving only the base which has this regular morphology resembling B. bigelowii, but slightly less asymmetric.

Farinacci & Howe catalog pages: Braarudosphaera regularis *

Distinguishing features: Braarudosphaera with pentagonal outline and bilateral symmetry, i.e. the sutures bisect the edges.

Geological Range:
Last occurrence (top): within Late Albian Substage (100.50-107.59Ma, top in Albian stage). Data source: Black 1973
First occurrence (base): within Early Aptian Substage (122.98-126.30Ma, base in Aptian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Braarudosphaera regularis, synonyms included - Braarudosphaera regularis; space-time plot :: Samples map :: Parent: Braarudosphaera

    References:

    Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

    de Kaenel, E. & Bergen, J. A. (1996). Mesozoic calcareous nannofossil biostratigraphy from sites 897, 899, and 901, Iberia Abyssal Plain: New biostratigraphic evidence. Proceedings of the Ocean Drilling Program. Scientific Results. 149: 27-59. gs

    Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs


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    Braarudosphaera regularis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10108 Go to Archive.is to create a permanent copy of this page - citation notes



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