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: C. hulliae *


Morphology: 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, CA: cross-axial, ca_disjunct,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 6->10µm;
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:

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 V O


nannotaxlogo400px

Coccolithus hulliae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-10-2020

Taxon Search:
Advanced Search

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



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics