Quadrum bengalensis


Classification: Mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Quadrum -> Quadrum bengalensis
Sister taxa: Q. gartneri, Q. svabenickae, Q. bengalensis, Q. intermedium, Q. eptabrachium, Q. octobrachium, Q. eneabrachium, Q. giganteum, Q. sp.,

Distinguishing features: Quadrum with one cycle larger than the other.


Taxonomy:

Citation: Quadrum bengalensis Burnett, 1997
Rank: Species

Farinacci & Howe catalog pages: Quadrum bengalensis * , ,

Distinguishing features: Quadrum with one cycle larger than the other.


Morphology remarks: A form of Quadrum which has one cycle larger then the other. The larger cycle appears to be slightly flared, and the elements slightly separated from one another. Differs from other Quadrum species with four elements per face in being distinctly wider at one end. [Burnett 1997]

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Late Maastrichtian Substage (66.04-69.91Ma, base in Maastrichtian stage). Data source: Burnett 1998

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: Quadrum bengalensis, synonyms included - Quadrum bengalensis; space-time plot :: Samples map :: Parent: Quadrum

    References:

    Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs


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    Quadrum bengalensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10967 Go to Archive.is to create a permanent copy of this page - citation notes



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