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:
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: R-prominent, rim-unicyclic, |
Lith size: 3.5->4.5µm; Data source notes: original description +/-0.5µm |
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:
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 Crux, J. A. (1989). Biostratigraphy and palaeogeographical applications of Lower Cretaceous nannofossils from north-western Europe. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series . 143-211. gs References:
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Rhagodiscus cepekii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-2-2025
Short stable page link: https://mikrotax.org/dinotax/index.php?id=11018 Go to Archive.is to create a permanent copy of this page - citation notes |
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