Nannotax3 - ntax_mesozoic - Eoconusphaera

Eoconusphaera


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

Distinguishing features:
Parent taxon (Eoconusphaeraceae): Nannoliths with a truncated-cone-like morphology constructed from an outer rim of thin, elements joined along vertical sutures, and an inner core of numerous radial lamellae that may protrude distally.
This taxon: 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 (time control age-window is: 0-800Ma)
Eoconusphaera hallstattensis

Eoconusphaera zlambachensis
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.
Eoconusphaera sp.
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.
Taxonomic discussion: Most commonly seen in side view.

Farinacci & Howe catalog pages: Eoconusphaera + + *

Distinguishing features:
Parent taxon (Eoconusphaeraceae): Nannoliths with a truncated-cone-like morphology constructed from an outer rim of thin, elements joined along vertical sutures, and an inner core of numerous radial lamellae that may protrude distally.
This taxon: 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.


Morphology:


Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, elliptical, cylindrical, CA: closed, CROSS-POLARS: rim-unicyclic,
Lith size: 5->10µm;
Data source notes: 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): 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 V O

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


nannotaxlogo400px

Eoconusphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-11-2022

Taxon Search:
Advanced Search

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



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics