Rhagodiscus robustus

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 broad rim (usually as broad or broader than the central area) and a central area spanned by a granular plate; a relatively large spine or spine base is usually present. The broad and blocky rim shows yellow interference colors under XPL.

Taxonomy:

Farinacci & Howe catalog pages: R. robustus *

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 broad rim (usually as broad or broader than the central area) and a central area spanned by a granular plate; a relatively large spine or spine base is usually present. The broad and blocky rim shows yellow interference colors under XPL.

Morphology:

See also: Zeugrhabdotus burwellensis - small species with some similarities;

Geological Range:
Last occurrence (top): within NC10a subzone (100.45-103.13Ma, top in Cenomanian stage). Data source: Bown 2005
First occurrence (base): within NC5 zone (121.52-128.82Ma, base in Hauterivian stage). Data source: Bown 2005

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Rhagodiscus robustus, synonyms included - Rhagodiscus robustus;
• See also space-time plot :: Samples map :: Parent: Rhagodiscus

Rhagodiscus robustus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-1-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11030 Go to Archive.is to create a permanent copy of this page - citation notes

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