Distinguishing features: Very large species of Coronocyclus
Original description: Diagnosis: A giant Coronocyclus having very large central opening and narrow shields.
Description: This comparatively large species has birefringent monocyclic distal and proximal shields of equal size and a large central opening. The elements of the distal shield have short spine-like peripheral projections. The shields are smooth but highly birefringent under polarised light.
Farinacci & Howe catalog pages: C. lordii *
Morphology: da Gama & Varol (2013) describe the species as having smooth shields but the illustrated specimens do not seem to show this.
Size: holotype 20µm, size range not given
|Tags||LITHS: placolith, circular, CA: vacant, |
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
|Metrics||Lith size: 15->25µm;|
Last occurrence (top): within NN4 zone (14.91-17.95Ma, top in Langhian stage). Data source: da Gama & Varol (2013)
First occurrence (base): within NN4 zone (14.91-17.95Ma, base in Burdigalian stage). Data source: da Gama & Varol (2013)
Plot of occurrence data:
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