Nannotax3 - ntax_mesozoic - Rhagodiscus cepekii Nannotax3 - ntax_mesozoic - Rhagodiscus cepekii

Rhagodiscus cepekii


Classification: ntax_mesozoic -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus cepekii
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 (~4µm) loxolith coccoliths with granular basal plate and 'cross-bars' supporting a large, flaring spine with serrated edges. In LM, this species may be virtually indistinguishable from small specimens of R. asper.


Taxonomy:

Citation: Rhagodiscus cepekii (Crux, 1987) Rutledge & Bown in Bown et al., 1998
taxonomic rank: Species
Basionym: Chiastozygus cepekii Crux, 1987

Farinacci & Howe catalog pages: C. cepekii *

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 (~4µm) loxolith coccoliths with granular basal plate and 'cross-bars' supporting a large, flaring spine with serrated edges. In LM, this species may be virtually indistinguishable from small specimens of R. asper.

Search data:
LITHS: murolith, elliptical, CA: grill, plate, process, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 3.5->4.5µm;
Data source notes: original description +/-0.5µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Barremian Substage (124.40-126.50Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Early Barremian Substage (124.40-126.50Ma, base in Barremian stage). Data source: Bown et al. 1998

Plot of occurrence data:

References:

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Crux, J. A. (1987c). Six new species of calcareous nannofossils from the Lower Cretaceous strata of England and Germany. INA Newsletter. 9(1): 30-35. gs


nannotaxlogo400px

Rhagodiscus cepekii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2024

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11018 Go to Archive.is to create a permanent copy of this page - citation notes
nannotaxlogo400px

Nannotax is being sponsored through 2024 by Woodside Energy and Shell USA


Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments

No comments yet. Be the first!