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, central area relatively broad and spanned by, raised, bridge-like structure.
Taxonomy:
Farinacci & Howe catalog pages: R. sageri *
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, central area relatively broad and spanned by, raised, bridge-like structure.
Morphology:
LITHS: murolith, elliptical, CA: plate, process, bar, CROSS-POLARS: rim-unicyclic, R-prominent, |
Lith size: 8->10µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Cenomanian Stage (93.9-100.5Ma, top in Cenomanian stage). Data source: Bown 2005
First occurrence (base): within NC4 zone (132.87-132.93Ma, base in Hauterivian stage). Data source: Bown 2005
Plot of occurrence data:
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Rhagodiscus sageri compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-12-2023
Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=11031 Go to Archive.is to create a permanent copy of this page - citation notes |
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