|Daughter taxa (time control age-window is: 0-800Ma)|
Low basal coccolith with a low arched bridge; both coccolith and process are weakly-birefringent.
Elliptical non-birefringent holococcolith comprising a narrow rim spanned by an arched, perforate bridge. The bridge is broad and pierced by a large central hole and has a distal covering that is finely perforate. Distinguishable in both plan and side views.
Small, narrowly-ellliptical non-birefringent holococcolith comprising a narrow rim spanned by diagonal cross-bars.
Medium sized, irregularly elliptical to polygonal holococcoliths, which are dark in XPL but have distinctly high relief in phase contrast. Central hole seen in LM is a perforate cover on the distal side.
Holococcolith that in side-view comprises a low basal coccolith and a relatively tall, hollow spine that tapers to a point. Both coccolith and spine are birefringent and crystallographically continuous in XPL.
A large, coarsely constructed, elliptical holococcolith with a central area spanned by a transverse, bridge-like structure that broadens at each end. The rim and bridge are crystallographically disjunct.
Specimens which cannot be assigned to any established species
Distinguishing features: Holococcoliths that typically have a spine or process and transverse bridge or bars.
Farinacci & Howe catalog pages: Orthozygus *Search data:
|Tags||LITHS: holococcolith, elliptical, CROSS-POLARS: V-prominent,|
|Metrics||Lith size: 3->8µm;|
Last occurrence (top): in upper part of Rupelian Stage (74% up, 29.6Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Lutetian Stage (23% up, 46.3Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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