Distinguishing features:
Parent taxon (Tubodiscus): Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.
This taxon: Medium sized (5-7 µm) with narrow shields / wide central area. In xpl the inner rim cycle is usually slightly narrower than the outer rim cycle
Taxonomy:
Farinacci & Howe catalog pages: T. bellii *
Distinguishing features:
Parent taxon (Tubodiscus): Tubodiscids with high and birefringent proximal collar cycle and wide central-area. Rim image is clearly bicyclic in XPL.
This taxon: Medium sized (5-7 µm) with narrow shields / wide central area. In xpl the inner rim cycle is usually slightly narrower than the outer rim cycle
Morphology:
The shields and individual cycles are narrower than those of other tubodiscids.
LITHS: placolith, elliptical, CA: vacant, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 5->7µm; Data source notes: original description +/-0.5 µm |
Geological Range:
Last occurrence (top): within Berriasian Stage (137.70-143.10Ma, top in Berriasian stage). Data source: Bown 2005
First occurrence (base): within Berriasian Stage (137.70-143.10Ma, base in Berriasian stage). Data source: Bown 2005
Plot of occurrence data:
Tubodiscus bellii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11273 Go to Archive.is to create a permanent copy of this page - citation notes |
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