|Daughter taxa (time control age-window is: 0-800Ma)|
Elliptical, medium sized placolith. Central-area with coarse grill clearly visible in LM (non-birefringent but easily seen in phase contrast). Proximal shield is birefringent but thin, and often detached, so coccolith is characteristically dark in XPL
Specimens which cannot be assigned to established species
Distinguishing features: Coccoliths elliptical, grill in central area
Farinacci & Howe catalog pages: Cryptococcolithus *
Morphology: Placolith coccoliths with Calcidiscus type structure but with thin proximal shield and so showing very low birefringence, with grill in central area.
|Tags||LITHS: placolith, elliptical, CA: grill, vacant, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
|Metrics||Lith size: 5->8µm;|
Notes: Never abundant but widespread.
Last occurrence (top): near top of Messinian Stage (86% up, 5.6Ma, in Messinian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Burdigalian Stage (32% up, 19Ma, in Burdigalian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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