|Daughter taxa (time control age-window is: 0-800Ma)|
Medium to large, circular coccoliths with broad rim, narrow, bright inner tube cycle (in XPL) and open central-area. Rim elements are strongly inclined.
Large circular coccoliths with broad, flat shield and rim elements joined along inclined sutures. Shield is dark in XPL but a narrow, brighter tube cycle is usually visible.
Specimens which cannot be assigned to any established species
Distinguishing features: Typically circular planolith coccoliths with broad, flat shield and rim elements joined along inclined sutures. Shield is dark in XPL but a narrow, brighter tube cycle may be present.
Farinacci & Howe catalog pages: Pedinocyclus * , Leptodiscus
Size: Medim to large size (5-14 µm)
|Tags||LITHS: planolith, circular, CA: vacant, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,|
|Metrics||Lith size: 5->14µm;|
Last occurrence (top): in upper part of Chattian Stage (73% up, 24.4Ma, in Chattian 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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