Rhagodiscus amplus


Classification: Mesozoic -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus amplus
Sister taxa: R. achlyostaurion, R. amplus, R. angustus, R. asper, R. cepekii, R. dekaenelii, R. infinitus, R. pseudoangustus, R. splendens, R. adinfinitus, R. gallagheri, R. indistinctus, R. pancostii, R. plebeius, R. robustus, R. sageri, R. eboracensis, R. hamptonii, R. nebulosus, R. reniformis, R. sp.,

Distinguishing features: 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.


Taxonomy:

Citation: Rhagodiscus amplus Bown, 2005
Rank: Species

Farinacci & Howe catalog pages: Rhagodiscus amplus *

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

Size: Holotype length = 9.8µm

Search data:
TagsLITHS: murolith, elliptical, CA: plate, process, R-UNITS: R-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 8->10µm;
Sources: 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 (125.95-126.40Ma, base in Barremian stage). Data source: Bown 2005

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Rhagodiscus amplus, synonyms included - Rhagodiscus amplus;
  • space-time plot :: Samples map :: Parent: Rhagodiscus

    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

    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: 17-2-2020

    Taxon Search:
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    Short stable page link: http://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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