Nannotax3 - Mesozoic - Ansulasphaera

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 bownii Ansulasphaera with wide central opening, short proximal shield and poorly developed tube cycles.
				Ansulasphaera covingtonii Ansulasphaera with an extended, conical, proximal shield and an elevated tube cycle on the distal side
				Ansulasphaera helvetica Ansulasphaera with an extended, conical, proximal shield and open central area.
				Cylindralithus nudus Elliptical; central area narrow and open.
				Ansulasphaera sp. 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.

Search data:

Tags	LITHS: placolith, elliptical, cylindrical, hollow, CA: vacant, V-UNITS: V-prominent, DETAILS: rim-unicyclic,
Metrics	Lith size: 3->6µm; Sources: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Watznaueriaceae

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 :: ::

Ansulasphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-7-2020

Taxon Search:

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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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