Calcidiscus premacintyrei


Classification: Coccolithophores -> Coccolithales -> Calcidiscaceae -> Calcidiscus -> C. leptoporus group -> Calcidiscus premacintyrei
Sister taxa: C. gallagheri, C. leptoporus, C. macintyrei, C. pataecus, C. premacintyrei, C. salomonii, C. tropicus,

Taxonomy:

Citation: Calcidiscus premacintyrei Theodoridis, 1984
Rank: Species
Notes & discussion: This species is similar to C. macintyrei but is limited in stratigraphical range, and readily distinguished by the elliptical central area.

Distinguishing features: Large, weakly elliptical species of Calcidiscus, central area open, and distinctly elliptical.

Farinacci & Howe catalog pages: Calcidiscus premacintyrei * , ,

Search data:
TagsLITHS: placolith, elliptical, sub-circular, CA: vacant,
CSPH: spherical, monomorphic, V-UNITS: distal shield, tube, R-UNITS: prox shield, DETAILS: isogyres oblique, rim-unicyclic,
MetricsLith size: 8->12µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: An age range of NN4 to NN6 is rather well established for this taxon (e.g. Theodoridis 1984, Young 1998). Backman et al. (2012) use the LAD to define the top of their zone CNM8.  Boesiger et al. (2017) give a very simlar age estimate for he LAD of
Last occurrence (top): in upper part of NN6 zone (60% up, 12.6Ma, in Serravallian stage). Data source: Backman et al. 2012 (fig. 2)
First occurrence (base): near base of NN4 zone (5% up, 17.8Ma, in Burdigalian stage). Data source: Boesiger et al. 2017

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: Calcidiscus premacintyrei, synonyms included - Calcidiscus premacintyrei; Calcidiscus premacintyrei (< 9 microns); Calcidiscus premacintyrei (> 9 microns); space-time plot :: Samples map :: Parent: C. leptoporus group

    References:

    Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A. , . (2017). Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. Journal of Nannoplankton Research. 37(2-3): 145-175. gs

    Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs

    Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs


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    Calcidiscus premacintyrei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=190 Go to Archive.is to create a permanent copy of this page - citation notes



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