Nannotax3 - ntax_mesozoic - Ansulasphaera helvetica Nannotax3 - ntax_mesozoic - Ansulasphaera helvetica

Ansulasphaera helvetica


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

Distinguishing features:
Parent taxon (Ansulasphaera): Watznaueriacean coccoliths with a tube-like/conical proximal shield.
This taxon: Ansulasphaera with an extended, conical, proximal shield and open central area.


Taxonomy:

Citation: Ansulasphaera helvetica Grün & Zweili, 1980
taxonomic rank: Species

Farinacci & Howe catalog pages: A. helvetica *

Distinguishing features:
Parent taxon (Ansulasphaera): Watznaueriacean coccoliths with a tube-like/conical proximal shield.
This taxon: Ansulasphaera with an extended, conical, proximal shield and open central area.

Search data:
LITHS: placolith, elliptical, cylindrical, hollow, CA: vacant, CROSS-POLARS: rim-unicyclic, V-prominent,
Lith size: 5->6µm;
Data source notes: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): near top of NJ13 zone (90% up, 162.2Ma, in Callovian stage). Data source: Bown & Cooper 1998 (fig. 4) - secondary events
First occurrence (base): at base of NJ12a subzone (0% up, 165.7Ma, in Bathonian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event

Plot of occurrence data:

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 O

Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs

Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. 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

Zweili, F. (1989). Fossile Coccolithophoriden aus dem Weissensteingebiet. Mitteilungen / Naturforschende Gesellschaft des Kantons Solothurn. 34: 199-213. gs O


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Ansulasphaera helvetica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2024

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Short stable page link: https://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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