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.
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 |  |  |  | Chiasmolithus consuetus
Medium to large Chiasmolithus with narrow centro-distal cycle and simple, narrow diagonal cross bars.
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 |  |  |  | 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.
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 |  |  |  | Chiasmolithus nitidus
Medium to small Chiasmolithus with narrow central area spanned by narrow diagonal bars (two curving and two relatively straight).
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 |  |  |  | Chiasmolithus titus
Medium to small Chiasmolithus with narrow central area spanned by one straight diagonal cross bar and one that is strongly bent/hooked.
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Taxonomy:
Citation: Chiasmolithus consuetus groupRank: species groupSynonyms: 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:
| Tags | LITHS: |
| Metrics | Lith 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:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Chiasmolithus
References:
Varol, O. (1992a). Sullivania a new genus of Palaeogene coccoliths. Journal of Micropalaeontology. 11: 141-150. gs V O
