Ansulasphaera


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Ansulasphaera
Sister taxa: Bussonius, Cyclagelosphaera, Diazomatolithus, Lotharingius, Watznaueria, Ansulasphaera, Bibreviconus, Perchnielsenella,

Distinguishing features: Watznaueriacean coccoliths with a tube-like/conical proximal shield.


Daughter taxa: (blue => in age window 0-800Ma)
Ansulasphaera species with wide central opening, short proximal shield and poorly developed tube cycles.
Ansulasphaera species with an extended, conical, proximal shield and an elevated tube cycle on the distal side
Ansulasphaera species with an extended, conical, proximal shield and open central area.
Elliptical; central area narrow and open.
Specimens not identified to species level

Taxonomy:

Citation: Ansulasphaera Grün and Zweili, 1980
Rank: Genus
Type species: Ansulasphaera helvetica Grün and Zweili, 1980.

Farinacci & Howe catalog pages: Ansulasphaera *

Distinguishing features: Watznaueriacean coccoliths with a tube-like/conical proximal shield.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Bathonian Stage (85% up, 166.4Ma, in Bathonian stage). Data source: Total of range of species in this database

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

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 compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10026 Go to Archive.is to create a permanent copy of this page - citation notes



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