Coccolithus gigas

Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Coccolithus -> C. gigas group -> Coccolithus gigas
Sister taxa: C. gigas, C. hulliae, C. opdykei, C. mutatus, C. staurion,


Citation: Coccolithus gigas Bramlette & Sullivan, 1961
Rank: Species
Basionym: Coccolithus gigas Bramlette & Sullivan, 1961
Synonyms: Sullivania gigas (Bramlette & Sullivan, 1961) Varol, 1992
Chiasmolithus gigas (Bramlette & Sullivan, 1961) Radomski, 1968
Notes & discussion: Traditionally included in Chiasmolithus, but the species does not fit readily in either of the two groups of Chiasmolithus species. Bown & Newsam (2017) observed a lineage from Coccolithus staurion to C. gigas and so concluded that it should be transferred from Chiasmolithus to Coccolithus.

Specimens with rotated, asymmetric cross-bars also occur but may have the same stratigraphic range.

Distinguishing features: Very large (~>15µm) Coccolithus-like coccolith with narrow central area crossed by broad diagonal bars.

Farinacci & Howe catalog pages: Coccolithus gigas + *

Morphology remarks: C. gigas has a distinctly wider shield than other members of the bidens group but clearly has bidens-type crossbars. Gartner (1970) and Romein (1979) suggest that it evolved from C. solitus, this would suggest that the distal shield widened but the central area stayed more or less the same size.

Search data:
TagsLITHS: placolith, elliptical, RIM: inner-tube-broad, psh-bicyclic, CA: cross, cross-diagonal-symmetric, diagonal cross,
CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, px-tube, V-prominent, R-UNITS: c-str, ds-tube, prox shield, R-prominent, DETAILS: cstr-w-median-ext-line-----, ca_disjunct, rim-bicyclic, isogyres oblique,
MetricsLith size: 15->24µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): within NP15b subzone (44.12-45.49Ma, base in Lutetian stage). Data source: Perch-Nielsen 1985

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: Coccolithus gigas, synonyms included - Chiasmolithus gigas; Coccolithus gigas; Sullivania gigas;
  • space-time plot :: Samples map :: Parent: C. gigas group


    Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs :: view :: open

    Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs :: view :: open

    Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs :: view :: open

    Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(129-188): -. gs :: ::

    Perch-Nielsen, K. (1972b). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs :: view :: open

    Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs :: view :: open

    Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs :: ::

    Radomski, A. (1968). Pozimy nannoplankton wapiennego w Paleogenie Polskich Karpat Zachodnich [Calcareous nannoplankton zones in Palaeogene of the western Polish Carpathiansl. Rocznik Polskie Towarzystwo Geologiczne. 38: 545-605. gs :: ::

    Varol, O. (1992a). Sullivania a new genus of Palaeogene coccoliths. Journal of Micropalaeontology. 11: 141-150. gs :: view :: open


    Coccolithus gigas compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-6-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

    Comments (1)

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    Ronald W. Morin (Morin Biostratigraphic Studies, US)
    You have placed Chiasmolithus gigas in the Chiasmolithus consuetus group (bars undivided in XPL or crossed polarized light). However, the majority of your images of C. gigas show a clear median extinction line. In addition, the holotype of C. gigas (in XPL) appears to show a hint of a median extinction line in the bottom-left bar. It would be helpful if the holotype of C. gigas could be re-photographed to definitely confirm that C. gigas belongs in the Chiasmolithus bidens group (bars divided by a median extinction line in XPL) rather than the Chiasmolithus consuetus group.
    Jeremy Young (UCL, UK)
    Very good point. I followed Perch-Nielsen (1985) and Varol (1992) here who did place gigas in this group but I am not sure that Gartner (1970) included gigas in his consuetus group. I will ask Paul Bown to take a look at this.
    Jeremy Young (UCL, UK)
    I have now transferred gigas to the bidens group. Gartner (1970) and Romein (1979) both place it in this group, on the basis of crossbar structure.
    Page 1 of 1

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