Coccolithus subcirculus

Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Coccolithus -> C. formosus group -> Coccolithus subcirculus
Sister taxa: C. crucis, C. foraminis, C. formosus, C. pauxillus, C. subcirculus,


Citation: Coccolithus subcirculus Bown 2016
Rank: Species

Distinguishing features: Small to medium sized sub-circular to circular Coccolithus with narrow central area

Farinacci & Howe catalog pages: Coccolithus subcirculus *

Morphology remarks:

Small to medium-sized Coccolithus with subcircular to circular outline and narrow, central area (less than the width of the rim). [Bown 2016]
The first appearance of the circular species Coccolithus formosus is typically cited as lower Eocene, but similar, near-circular coccoliths of Coccolithus are found in this study from Zone NP5 and are described as a new species. It is distinguished from Coccolithus formosus by its typically subcircular outline and older stratigraphic range (Coccolithus formosus ranges from the lower Eocene to lower Oligocene). Distinguished from Coccolithus foraminis by its narrower central area. [Bown 2016]

Search data:
TagsLITHS: placolith, elliptical, RIM: inner-tube-broad, psh-bicyclic, CA: vacant,
CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, px-tube, V-prominent, R-UNITS: ds-tube, prox shield, R-prominent, DETAILS: rim-bicyclic, isogyres oblique,
MetricsLith size: 3->8┬Ám;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP5 zone (59.54-61.51Ma, top in Selandian stage). Data source: Bown 2016
First occurrence (base): within NP5 zone (59.54-61.51Ma, base in Selandian stage). Data source: Bown 2016

Plot of occurrence data:

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


    Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs :: view :: open


    Coccolithus subcirculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-8-2020

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

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