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:
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:
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. gsReferences:
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Ansulasphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-12-2019
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 |