Quadrum svabenickae


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

Distinguishing features: Like Q. gartneri but with a central depression and elements that appear to be thickened at the edges.


Taxonomy:

Citation: Quadrum svabenickae Burnett, 1997
Rank: Species
Notes & discussion: Orthography the specific epithet svabenickae is in honour of the nannofossil specialist Lilian Svabenicka since this is a female name ending in -a the correct form is svabenickae not svabenickiae

Farinacci & Howe catalog pages: Quadrum svabenickae *

Distinguishing features: Like Q. gartneri but with a central depression and elements that appear to be thickened at the edges.


Morphology remarks: A species of Quadrum which has an excavated central area and elements which appear to be particularly thickened at the edges. Differs from other species in the genus with four elements per face in possessing an excavated central area and thick outer corners. [Burnett 1997]

Geological Range:
Notes: FAD in UC15 in Tethyan realm (Burnett 1998)
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 Coniacian Stage (86.26-89.77Ma, base in Coniacian 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 svabenickae, synonyms included - Quadrum svabenickae;
  • 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

    Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-60. gs

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 30(1): 39-56. gs


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    Quadrum svabenickae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-11-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10975 Go to Archive.is to create a permanent copy of this page - citation notes



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