Calcidiscus macintyrei
Ancestry: Coccolithophores -> Coccolithales -> Calcidiscaceae -> Calcidiscus -> C. leptoporus group -> Calcidiscus macintyrei
Sister taxa: C. gallagheri, C. leptoporus, C. macintyrei, C. pataecus, C. premacintyrei, C. salomonii, C. tropicus,
Short diagnosis: Large (>10µm) Pliocene circular species of Calcidiscus with central opening.
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Taxonomy:
Citation: Calcidiscus macintyrei (Bukry and Bramlette, 1969) Loeblich and Tappan, 1978 Rank: SpeciesBasionym: Cyclococcolithus macintyrei Bukry and Bramlette, 1969Notes & discussion: Usually confined to specimens >10µm to allow unambiguous biostratigraphic use. Essentially this is a large variant of C. tropicus.
Farinacci & Howe catalog pages: Cyclococcolithus macintyrei *
Short diagnosis: Large (>10µm) Pliocene circular species of Calcidiscus with central opening.
Geological Range:
Notes: Use of the name C. macintyrei is normally confined to the large specimens occurring in the Plioceneand early Pleistocene although similar morphotypes do occur in the Miocene. The last occurrence of the species has been used as a sub-zonal marker (Raffi et al. 2006). However, it is often rare near its top which can make placement of the event dificult.
Last occurrence (top): in mid part of MIS-58 Isotope stage (50% up, 1.7Ma, in Calabrian stage). Data source: Raffi et al. 2006
First occurrence (base): within NN6 zone (11.90-13.53Ma, base in Serravallian stage). Data source: Young 1998
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Histogram - Neptune occurrence data from DSDP and ODP proceedings. Interpret with caution & read these notes
- Taxon plotted: Calcidiscus macintyrei, synonyms included - Calcidiscus macintyrei; Calcidiscus macintyrei (>11 um); Calcidiscus macintyrei (grainy); Cyclococcolithina macintyrei; Cyclococcolithus macintyrei; Calcidiscus tropicus (<10 µm); Parent: C. leptoporus group
References:Bukry, D. & Bramlette, M.N., (1969). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology, 7: 131-142.
Loeblich, A.R. & Tappan, H., (1978). The coccolithophorid genus Calcidiscus Kamptner and its synonyms. Journal of Paleontology, 52: 1390-1392.
Raffi, I.; Backman, J.; Fornaciari, E.; Palike, H.; Rio, D.; Lourens, L.J. & Hilgen, F.J., (2006). A review of calcareous nannofossil astrobiochronology encompassing the past 25 million years. Quaternary Science Reviews, 25: 3113-3137.
Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.
Nannotax3 - Coccolithophores - Calcidiscus macintyrei by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-6-2017
