|Daughter taxa (time control age-window is: 0-800Ma)|
Multi-element, cavate, box-like holococcolith with a pointed apical structure. The walls of the box and apical structure comprise narrow, birefringent, crystallographically distinct elements that are birefringent in XPL.
Small to medium-sized, thin-walled, box-like holococcolith with a gently curved upper surface. The thin, birefringent walls comprise at least four crystallographically distinct blocks.
Medium-sized, thin-walled, dome-like holococcolith. The thin, birefringent walls form a proximal plate and a domed upper surface. The dome broadens distally from the basal plate, and is of similar height and width or taller.
Small, thin-walled, cavate holococcolith with a domed upper surface. The cavate central-area space is filled with small, birefringent elements and at least two prominent vertical plates.
Small, elliptical to lenticular coccolith with a narrow, birefringent rim (as viewed in light microscope). When orientated at 0° the rim is crossed by narrow N-S and E-W extinction lines.
Specimens which cannot be assigned to any established species
Distinguishing features: Cavate, thin walled, box-like holococcoliths usually seen in side view.
Farinacci & Howe catalog pages: Varolia *Search data:
|Tags||LITHS: holococcolith, elliptical, hollow,|
|Metrics||Lith size: 2.5->6µm;|
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 (35% up, 45.5Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1476 Go to Archive.is to create a permanent copy of this page - citation notes