Coccolithus hulliae


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

Taxonomy:

Citation: Coccolithus hulliae Bown & Newsam 2017
Rank: Species
Variants:

Distinguishing features: Broadly elliptical; central area width similar to shield width, spanned by conspicuous axial crossbars.

Farinacci & Howe catalog pages: Coccolithus hulliae *


Morphology remarks: Broadly elliptical coccolith with Ericsonia-like shield image and moderately wide central area (similar to shield width), spanned by conspicuous axial crossbars.
Remarks: In XPL the shields appear similar to Ericsonia (i.e. with broad, bright tube cycle). Although Ericsonia coccoliths are rarely and sporadically seen through the Eocene, these are usually small, circular forms and we consider it most likely that this species arose from a Coccolithus ancestor. Coccolithus hulliae appears to be stratigraphically restricted to Zones NP14–15 in the Exp. 342 material. This species may have been identified as Ericsonia insolita Perch-Nielsen, 1971 in Bralower & Mutterlose (1995) and documented as having a first appearance in Subzone NP14a.
Differentiation: Distinguised from other Coccolithus and Ericsonia by its distinctive shield image in XPL and moderately wide central area with conspicuous axial crossbars.  [Bown & Newsam 2017]

Size: Holotype L = 8.4μm (Paratype L = 8.6μm).

Search data:
TagsLITHS: placolith, elliptical, RIM: psh-bicyclic, CA: cross, cross-axial,
CSPH: spherical, monomorphic, V-UNITS: distal shield, px-tube, R-UNITS: c-str, ds-tube, prox shield, DETAILS: ca_disjunct, rim-bicyclic, isogyres oblique,
MetricsLith size: 6->10µm;
Sources:
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: Bown & Newsam 2017
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: C. gigas group

    References:

    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


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    Coccolithus hulliae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=326 Go to Archive.is to create a permanent copy of this page - citation notes



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