C. consuetus group

Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Chiasmolithus -> C. consuetus group
Sister taxa: C. bidens group, C. consuetus group, C. sp.

Daughter taxa (time control age-window is: 0-800Ma)
Chiasmolithus californicus
Very large (>12 µm) Chiasmolithus with simple diagonal cross bars that may be slightly rotated from diagonal.
Chiasmolithus consuetus
Medium to large Chiasmolithus with narrow centro-distal cycle and simple, narrow diagonal cross bars.
Chiasmolithus danicus
Small to moderate Chiasmolithus with diagonal cross formed from two curving and two straight bars; two of the bars are offset. High degree of variability reported.
Chiasmolithus nitidus
Medium to small Chiasmolithus with narrow central area spanned by narrow diagonal bars (two curving and two relatively straight).
Chiasmolithus titus
Medium to small Chiasmolithus with narrow central area spanned by one straight diagonal cross bar and one that is strongly bent/hooked.


Citation: Chiasmolithus consuetus group
Rank: species group
Synonyms: Sullivania Varol 1992 [type species C. consuetus] - see notes on the genus Chiasmolithus

Distinguishing features: Upper-tube cycle weakly developed; cross bars with simple construction, no median exinction line

Farinacci & Howe catalog pages: Sullivania *

Morphology: The distal shield is normally wide and the upper tube elements are weakly developed, in some specimens the distal shield can be traced into the central area and usually the distal surface slopes into the central opening.

Search data:
MetricsLith size: 5->17µm;
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): in lower part of Danian Stage (28% up, 64.8Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Varol, O. (1992a). Sullivania a new genus of Palaeogene coccoliths. Journal of Micropalaeontology. 11: 141-150. gs V O


C. consuetus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=164 Go to Archive.is to create a permanent copy of this page - citation notes

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