|Daughter taxa (time control age-window is: 0-800Ma)|
Very large (~>15µm) Coccolithus-like coccolith with narrow central area crossed by broad diagonal bars.
Broadly elliptical; central area width similar to shield width, spanned by conspicuous axial crossbars.
Very large (>14 µm) Coccolithus with wide central area and narrow, axial to slightly rotated cross bars.
Large to very large (7-15 µm) Coccolithus with a narrow central area and axial cross bars.
Distinguishing features: Large to very large; central areas narrow to moderately-wide, with crossbars that are conspicuous in LM.
Farinacci & Howe catalog pages:
Morphology: Large to very large Coccolithus coccoliths with narrow to moderately-wide central areas spanned by crossbars that are conspicuous in light microscope.
Remarks: These coccoliths have previously been variously classified within the genera Cruciplacolithus, Chiasmolithus and Coccolithus but appear to represent a coherent lineage with stratigraphic range restricted to the mid-part of the Eocene (Zones 14–16). The inclusion of these species within the genus Coccolithus is consistent with the extant Coccolithus species, which can also produce central area bars and crosses.
Included species: C. gigas, C. mutatus, C. opdykei, C. staurion. [Bown& Newam 2017]
See also: Cruciplacolithus ;Coccolithus tenuiforatus ;Search data:
|Metrics||Lith size: 6->24µm;|
Last occurrence (top): in upper part of Lutetian Stage (74% up, 42.9Ma, in Lutetian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Thanetian Stage (62% up, 57.2Ma, in Thanetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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