Nannotax3 - ntax_main - Rhagodiscus amplus Nannotax3 - ntax_main - Rhagodiscus amplus

Rhagodiscus amplus


Classification: ntax_main -> Mesozoic nannofossils -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus amplus
Sister taxa: R. achlyostaurion, R. amplus, R. angustus, R. asper, R. cepekii, R. dekaenelii, R. infinitus, R. manifestus NOMEN NUDUM, R. pseudoangustus, R. splendens ⟩⟨ R. adinfinitus, R. buisensis, R. gallagheri, R. indistinctus, R. pancostii, R. plebeius, R. robustus, R. sageri, R. sicutclipeus ⟩⟨ R. eboracensis, R. hamptonii, R. reniformis, R. sp.


Taxonomy:
Citation: Rhagodiscus amplus Bown 2005
Taxonomic rank: species
Basionym: Rhagodiscus amplus * Bown 2005

Synonyms:

Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Large (>8.0 µm) loxolith coccoliths with a wide central area (usually greater than twice as wide as the rim) that is spanned by a granular plate. A relatively large spine or spine base is typically present. The rim and plate usually show yellow interference colors in XPL.


Morphology:
Similar in general morphology to Rhagodiscus asper, but distinguished by its larger size.

Size:
Holotype length = 9.8µm

Search data:
LITHS: murolith, elliptical, CA: plate, process, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 8->10µm;
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 NC8b subzone (110.73-112.65Ma, top in Albian stage). Data source: Bown 2005
First occurrence (base): within NC6a subzone (120.51-121.52Ma, base in Barremian stage). Data source: Bown 2005

Plot of occurrence data:

References:

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

Gale, A. S., et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs

Kennedy, W. J., et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs


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Rhagodiscus amplus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-10-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11015 Go to Archive.is to create a permanent copy of this page - citation notes



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