Nannotax3 - ntax_mesozoic - Rhagodiscus pancostii Nannotax3 - ntax_mesozoic - Rhagodiscus pancostii

Rhagodiscus pancostii


Classification: ntax_mesozoic -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus pancostii
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. sicutclipeus ⟩⟨ R. eboracensis, R. hamptonii, R. reniformis, R. sp.

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 (holotype 4 µm), with small slender spine with bright tip


Taxonomy:

Citation: Rhagodiscus pancostii Lees, 2007
taxonomic rank: Species

Farinacci & Howe catalog pages: R. pancostii *

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 (holotype 4 µm), with small slender spine with bright tip


Morphology:

"A small, elliptical species of Rhagodiscus that bears a very small, delicate spine. The spine-tip appears bright in XPL. Differentiation: Similar to R. achlyostaurion, but with a spine-base/top that is much smaller, and does not occupy most of the central area. R. gallagheri is somewhat similar, but has no spine and is more narrowly elliptical. The specimen in Pl.4, figs 5, 6 has a narrower, brighter rim, which differs from that seen in R. pancostii; this specimen may be Orastrum partitum." [Lees 2007]

Size:
Holotype dimensions: L = 3.96μm, W = 2.86μm

Search data:
LITHS: murolith, elliptical, CA: plate, process, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 3->5µm;
Data source notes: holotype +/-1µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Turonian Substage (92.90-93.90Ma, top in Turonian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Early Turonian Substage (92.90-93.90Ma, base in Turonian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

References:

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs O


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Rhagodiscus pancostii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-4-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11026 Go to Archive.is to create a permanent copy of this page - citation notes
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