Eoconusphaera


Classification: Mesozoic -> Nannoliths inc sedis -> Eoconusphaeraceae -> Eoconusphaera
Sister taxa: Conusphaera, Eoconusphaera,

Distinguishing features: Tall tapering nannoliths with steeply sloping rim and central area filled with a mass of radially arranged elements. LM image shows relatively uniformily birefringent core with axial extinction line.


Daughter taxa: (blue => in age window 0-800Ma)
Tall tapering nannoliths with steeply sloping rim and central area filled with a mass of radially arranged elements. Most commonly seen in side view. LM image shows relatively uniformily birefringent core with axial extinction line.
Specimens not identified to species level

Taxonomy:

Citation: Eoconusphaera Jafar, 1983
Rank: Genus
Type species: Eoconusphaera tollmaniae Jafar, 1893 junior synonym of Conusphaera zlambachensis Moshkovitz, 1982.
Notes & discussion: Most commonly seen in side view.

Farinacci & Howe catalog pages: Eoconusphaera + * , ,

Distinguishing features: Tall tapering nannoliths with steeply sloping rim and central area filled with a mass of radially arranged elements. LM image shows relatively uniformily birefringent core with axial extinction line.

Geological Range:
Last occurrence (top): near base of Hettangian Stage (10% up, 201.1Ma, in Hettangian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Norian Stage (50% up, 218.9Ma, in Norian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs

Jafar, A. S. (1983). Significance of Late Triassic calcareous Nannoplankton from Austria and Southern Germany. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 166: 218-259. gs


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Eoconusphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10427 Go to Archive.is to create a permanent copy of this page - citation notes



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