Rhagodiscus gallagheri

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: Small (<5µm), elliptical Rhagodiscus with a length/width ratio of <2.5, straight or slightly convex longer sides, and a central area filled with a granular plate which supports a hollow spine base.

Taxonomy:

Farinacci & Howe catalog pages: R. gallagheri *

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: Small (<5µm), elliptical Rhagodiscus with a length/width ratio of <2.5, straight or slightly convex longer sides, and a central area filled with a granular plate which supports a hollow spine base.

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: Bown et al. 1998
First occurrence (base): at base of BC18 zone (0% up, 120.7Ma, in Aptian stage). Data source: Bown et al. 1998 - zonal marker

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 gallagheri, synonyms included - Rhagodiscus gallagheri;
• See also space-time plot :: Samples map :: Parent: Rhagodiscus

Rhagodiscus gallagheri compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11021 Go to Archive.is to create a permanent copy of this page - citation notes

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