Octocyclus magnus


Classification: Mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Octocyclus -> Octocyclus magnus
Sister taxa: O. magnus, O. reinhardtii, O. sp.,

Distinguishing features: Large podorhabdid with central area spanned by eight bars that delineate eight large perforations that run either side of the longitudinal axis. Central hollow spine.


Taxonomy:

Citation: Octocyclus magnus Black, 1972
Rank: Species
Notes & discussion: Probably a junior synonym of O. reinhardtii (Bukry 1969), but arguably useful for particluarly large (>12µm) mid Cretaceous forms.

Farinacci & Howe catalog pages: Octocyclus magnus *

Distinguishing features: Large podorhabdid with central area spanned by eight bars that delineate eight large perforations that run either side of the longitudinal axis. Central hollow spine.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Bown et al. 1998
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian 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: Octocyclus magnus, synonyms included - Octocyclus magnus; space-time plot :: Samples map :: Parent: Octocyclus

    References:

    Black, M. (1972). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs

    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

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 192: 221-253. gs

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    Octocyclus magnus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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