Rhagodiscus achlyostaurion


Classification: Mesozoic -> Eiffellithales -> Rhagodiscaceae -> Rhagodiscus -> Rhagodiscus achlyostaurion
Sister taxa: R. achlyostaurion, R. adinfinitus, R. amplus, R. angustus, R. asper, R. cepekii, R. dekaenelii, R. eboracensis, R. gallagheri, R. hamptonii, R. indistinctus, R. infinitus, R. nebulosus, R. pancostii, R. plebeius, R. pseudoangustus, R. reniformis, R. robustus, R. sageri, R. splendens, R. sp.,

Distinguishing features: Small (<5µm) Rhagodiscus with relatively narrow central area spanned by a granular plate bearing large spine/spine base. The rim image is distinctly dark in XPL.


Taxonomy:

Citation: Rhagodiscus achlyostaurion (Hill, 1976) Doeven, 1983
Rank: Species
Basionym: Parhabdolithus achlyostaurion Hill, 1976

Farinacci & Howe catalog pages: Parhabdolithus achlyostaurion + * , ,

Distinguishing features: Small (<5µm) Rhagodiscus with relatively narrow central area spanned by a granular plate bearing large spine/spine base. The rim image is distinctly dark in XPL.

Geological Range:
Last occurrence (top): within Coniacian Stage (86.26-89.77Ma, top in Coniacian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Aptian Substage (112.95-122.98Ma, base in Aptian stage). Data source: Bown et al. 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Rhagodiscus achlyostaurion, synonyms included - Parhabdolithus achylostaurion; Rhagodiscus achlyostaurion; Rhagodiscus achylostaurion; space-time plot :: Samples map :: Parent: Rhagodiscus

    References:

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

    Doeven, P. H. (1983). Cretaceous nannofossil stratigraphy and paleoecology of the Canadian Atlantic Margin. Bulletin of the Geological Survey of Canada. 356: 1-70. gs

    Hill, M. E. (1976). Lower Cretaceous calcareous nannofossils from Texas and Oklahoma. Palaeontographica Abteilung B. 156: 103-179. gs


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    Rhagodiscus achlyostaurion compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11013 Go to Archive.is to create a permanent copy of this page - citation notes



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