Nannoconus - atypical


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

Distinguishing features: Atypical nannoconids, not fitting in any of the main groups


Daughter taxa: (blue => in age window 0-800Ma)

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

Taxonomy:

Citation: Nannoconus - atypical
Rank: species group
Notes & discussion: informal grouping first used here

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

Distinguishing features: Atypical nannoconids, not fitting in any of the main groups

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: 15-11-2019

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Short stable page link: http://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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