Nannotax3 - ntax_mesozoic - Uniplanarius clarkei

Uniplanarius clarkei


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Uniplanarius -> Uniplanarius clarkei
Sister taxa: U. clarkei, U. gothicus, U. sissinghii, U. trifidus, U. sp.

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Small, square Uniplanarius with rounded corners, formed from four blocks joined along axial sutures that are marked in XPL by relatively broad zones of darker birefringence, together resembling the blades of a propeller. The outer edges of the nannolith may show slightly higher birefringence.


Taxonomy:

Citation: Uniplanarius clarkei Lees & Bown, 2005
Rank: Species

Farinacci & Howe catalog pages: U. clarkei *

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Small, square Uniplanarius with rounded corners, formed from four blocks joined along axial sutures that are marked in XPL by relatively broad zones of darker birefringence, together resembling the blades of a propeller. The outer edges of the nannolith may show slightly higher birefringence.


Morphology:


Size:
Length/width 3.3-4.0(3.3)µm.

Search data:
LITHS: nannolith-radiate, quadrate, star-shaped, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 3->4µm; Segments: 4->4;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Late Maastrichtian Substage (66.04-69.91Ma, top in Maastrichtian stage). Data source: Lees & Bown 2005
First occurrence (base): within Early Campanian Substage (80.64-83.64Ma, base in Campanian stage). Data source: Lees & Bown 2005

Plot of occurrence data:

References:

Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs V O


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Uniplanarius clarkei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11287 Go to Archive.is to create a permanent copy of this page - citation notes



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