Nannotax3 - ntax_mesozoic - Nannoconus - atypical

Nannoconus - atypical


Classification: ntax_mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> Nannoconus - atypical
Sister taxa: N. steinmannii group, N. kamptneri group, N. abundans group, N. truittii group, N. circularis group, N. compressus group, Nannoconus - atypical, N. sp.

Distinguishing features:
Parent taxon (Nannoconus): Conical, globular or cylindrical nannoliths composed of plates spirally-arranged around an axial cavity (~>1µm in width) or canal (~<1µm in width). Plate c-axes are arranged tangentially to the longitudinal axis.
This taxon: Atypical nannoconids, not fitting in any of the main groups


Daughter taxa (time control age-window is: 0-800Ma)
Nannoconus funiculus

Nannoconus ligius
A petaloid nannolith with eight rays.
Nannoconus magnadiscus
Large (>10 µm), flat species - disk-shaped
Nannoconus nicholasii
Short, parallel-sided Nannoconus, formed of triangular plates with a median depression, bordered by ridges, creating a shallow ‘w’- shaped margin.
Nannoconus pseudoseptentrionalis
Short nannoconid with narrow canal and ragged outline in plan view. Seen mainly in plan view.
Nannoconus sabinae

Taxonomy:

Citation: Nannoconus - atypical
Rank: species group

Taxonomic discussion:
informal grouping first used here

Farinacci & Howe catalog pages: Nannoconus - atypical [no catalog entry yet]

Distinguishing features:
Parent taxon (Nannoconus): Conical, globular or cylindrical nannoliths composed of plates spirally-arranged around an axial cavity (~>1µm in width) or canal (~<1µm in width). Plate c-axes are arranged tangentially to the longitudinal axis.
This taxon: Atypical nannoconids, not fitting in any of the main groups

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,
MetricsLith size: 5->15┬Ám;
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): at top of Coniacian Stage (100% up, 86.3Ma, in Coniacian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Tithonian Stage (62% up, 147.7Ma, in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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Nannoconus - atypical compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10719 Go to Archive.is to create a permanent copy of this page - citation notes



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