Calcidiscus macintyrei

Classification: 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.


Citation: Calcidiscus macintyrei (Bukry and Bramlette, 1969) Loeblich and Tappan, 1978
Rank: Species
Basionym: Cyclococcolithus macintyrei Bukry and Bramlette, 1969
Notes & 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.

Search data:
TagsLITHS: placolith, circular, RIM: rim-broad, CA: vacant,
CSPH: spherical, monomorphic, V-UNITS: distal shield, tube, R-UNITS: prox shield, DETAILS: isogyres oblique, rim-unicyclic,
MetricsLith size: 10->14µm;
The morphological data given here can be used on the advanced search page. See also these notes

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:


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.


Calcidiscus macintyrei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2017

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Comments (1)

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Kevin Jackson (US)
This page references Raffi et al., (2006), yet the top occurrence (~0.44Ma) doesn't appear to reflect the updated top occurrence of ~1.64Ma. Regarding the base occurrence Raffi (2006) states "LO of Calcidiscus macintyrei (alternative marker for CN3–CN4 boundary): highly contradictory stratigraphic positions are reported for this biohorizon in the literature and partly related to the ambiguous taxonomic status of this species (see Raffi et al., 1995)." It seems like the geological range is ambiguous. I don't have access to some of the other papers, so I was curious how reliable the geological range is for this nanno. Is is the range isochronous?
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