Ansulasphaera helvetica


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

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


Taxonomy:

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

Farinacci & Howe catalog pages: A. helvetica *

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

Search data:
Tagsplacolith, elliptical, cylindrical, hollow, CA: vacant, V-UNITS: V-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 5->6µm;
Data source notes: original description
Sources: 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, 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:

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

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 V O


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Ansulasphaera helvetica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2020

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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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