Ansulasphaera helvetica


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Ansulasphaera -> Ansulasphaera helvetica
Sister taxa: A. bownii, A. covingtonii, A. helvetica, C. nudus, A. sp.,

Distinguishing features: Ansulasphaera species with an extended, conical, proximal shield and open central area.


Taxonomy:

Citation: Ansulasphaera helvetica Grün & Zweili, 1980
Rank: Species

Farinacci & Howe catalog pages: Ansulasphaera helvetica * , ,

Distinguishing features: Ansulasphaera species with an extended, conical, proximal shield and open central area.

Geological Range:
Last occurrence (top): near top of NJ13 zone (90% up, 163.8Ma, in Callovian stage). Data source: Bown & Cooper 1998 (fig. 4) - secondary events
First occurrence (base): at base of NJ12a subzone (0% up, 166.4Ma, in Bathonian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Ansulasphaera

    References:

    Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

    Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs


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    Ansulasphaera helvetica 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=10029 Go to Archive.is to create a permanent copy of this page - citation notes



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