Braarudosphaera stenorhetha


Classification: Mesozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Braarudosphaera -> Braarudosphaera stenorhetha
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: Stellate Braarudosphaera with long, relatively narrow rays due to deep indentations where the sutures meet the lith edge.


Taxonomy:

Citation: Braarudosphaera stenorhetha Hill, 1976
Rank: Species
Synonyms: Braarudosphaera minuta Filewicz, Wind & Wise 1977 in Wise & Wind 1977 - the two taxa were of similar morphology and size (5-7µm) and were both described from the Albian [my interpretation - JRY 2015]
Notes & discussion: According to Lambert (1986) this is not a real species but a presevational variant of B. africana produced by breakage of elevated B. africana specimens

Farinacci & Howe catalog pages: Braarudosphaera stenorhetha * , Braarudosphaera minuta *

Distinguishing features: Stellate Braarudosphaera with long, relatively narrow rays due to deep indentations where the sutures meet the lith edge.

Geological Range:
Last occurrence (top): within Late Albian Substage (100.50-107.59Ma, top in Albian stage). Data source: [PRB rough estimate]
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian 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 stenorhetha, synonyms included - Braarudosphaera stenorhetha;
  • space-time plot :: Samples map :: Parent: Braarudosphaera

    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

    Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

    Hill, M. E. (1976). Lower Cretaceous calcareous nannofossils from Texas and Oklahoma. Palaeontographica Abteilung B. 156: 103-179. gs

    Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs

    Lambert, B. (1986). La notion d'espèce chez le genre Braarudosphaera Deflandre, 1947: mythe et réalité. Revue de Micropaleontologie. 28(4): 255-264. gs

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

    Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs


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    Braarudosphaera stenorhetha compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10110 Go to Archive.is to create a permanent copy of this page - citation notes



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