|Daughter taxa (time control age-window is: 0-800Ma)|
Typical medium sized Clausicoccus species.
Large Clausicoccus (>10µm) with wide shield and bright but indistinctly perforate central area plate.
Small Clausicoccus with narrow central area typically equal to the rim width.
Large Clausicoccus with wide central area typically twice as broad or greater than rim width.
Specimens which cannot be assigned to established species
Distinguishing features: Rim structure like Coccolithus; perforate plate covers the central area on the distal side
Farinacci & Howe catalog pages: Clausicoccus * , Clausibella *
Morphology: Coccolith rim structure similar to that of Coccolithus, but with a perforate plate covering the central area on the distal side. Centro-distal cycle (bright in XPL) may be narrow or reduced.
The plate typically shows significant birefringence but also appears dark in phase contrast so it may, like the inner tube of Coccolithus, be formed of two layers the upper of R-units and the lower of V-units
|Tags||LITHS: placolith, elliptical, CA: ca_disjunct, plate, pores, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
|Metrics||Lith size: 4.5->14µm;|
Last occurrence (top): in lower part of Burdigalian Stage (32% up, 19Ma, in Burdigalian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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