arrayname: original
Taxonomy:
Distinguishing features:
Parent taxon (Pontosphaera): Coccoliths are muroliths, central area with variable number of perforations. V-units form narrow imbricate outer wall, R-units form inner wall and central-area.
This taxon: Very large, broadly elliptical with broad, low rim and narrow to closed central opening.
Farinacci & Howe catalog pages: P. hollisii *
Morphology:
Differentiation: Distinguised from other Pontosphaera by larger size, broad rim cycle and low birefringence in cross-polarised light. [Bown & Newsam 2017]
Size:
LITHS: murolith, elliptical, CA: closed, CROSS-POLARS: V-prominent, R-prominent, rim-bicyclic, |
Lith size: 16->20µm; Data source notes: lith size from OD and slightly extended |
Geological Range:
Last occurrence (top): within NP15c subzone (42.87-44.12Ma, top in Lutetian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP15b subzone (44.12-45.49Ma, base in Lutetian stage). Data source: Bown & Newsam 2017
Plot of occurrence data:
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Pontosphaera hollisii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1076 Go to Archive.is to create a permanent copy of this page - citation notes |
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