C. biparteoperculatus group


Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Coccolithus -> C. biparteoperculatus group
Sister taxa: C. pelagicus group, C. formosus group, C. biparteoperculatus group, C. gigas group, C. sp.,

Daughter taxa: (blue => in age window 0-800Ma)
Like Coccolithus pelagicus but the tube cycle may be indistinct and the narrow central area is filled by a two-part oval bar with a transverse suture.
Medium to large elliptical Coccolithus with narrow central area filled or almost filled by a broad transverse disjunct bar.
Small to medium-sized ellipticalCoccolithus with narrow central area filled by a birefringent broad, oval transverse bar, which is bright at around 45° to the polarizing direction.

Taxonomy:

Citation: Coccolithus biparteoperculatus group
Rank: species group
Notes & discussion: informal grouping of similar species, which may not be closely related

Distinguishing features: Central area filled by broad bar

Farinacci & Howe catalog pages:

Search data:
TagsLITHS: placolith, elliptical, RIM: psh-bicyclic, CA: bar-transverse, Placoliths: closed,
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: 3->12µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in lower part of Chattian Stage (25% up, 26.8Ma, in Chattian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (28% up, 53.7Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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C. biparteoperculatus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-11-2019

Taxon Search:
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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=163 Go to Archive.is to create a permanent copy of this page - citation notes



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