C. formosus group


Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Coccolithus -> C. formosus 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)
Large circular Coccolithus with narrow central area spanned by thin cross-bars.
Large subcircular Coccolithus with wide and vacant central area (< or = to the width of the shields).
Large circular Coccolithus with narrow central area.
Small (<5µm) circular Coccolithus coccoliths with narrow, open central area.
Small to medium sized sub-circular to circular Coccolithus with narrow central area

Taxonomy:

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

Distinguishing features: Circular to subcircular

Farinacci & Howe catalog pages:

Search data:
TagsLITHS: placolith, elliptical, RIM: inner-tube-broad, psh-bicyclic, CA: vacant,
CSPH: spherical, monomorphic, V-UNITS: distal shield, px-tube, R-UNITS: ds-tube, prox shield, DETAILS: 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 Rupelian Stage (17% up, 32.9Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Selandian Stage (4% up, 61.5Ma, in Selandian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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C. formosus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2019

Taxon Search:
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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=166 Go to Archive.is to create a permanent copy of this page - citation notes



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