Taxonomy:
Distinguishing features: Large, narrowly elliptical, lens-shaped pontosphaerid with high rim and apparently vacant central area.
Farinacci & Howe catalog pages: P. romansii *
Morphology: Large, narrowly elliptical, lens-shaped pontosphaerid with high rim and apparently vacant central area.
Differentiation: Distinguised from other pontosphaerids by the high, lens-shaped rim. [Bown & Newsam 2017]
Size: Holotype L = 10.5μm (Paratype L = 11.9μm). [Bown & Newsam 2017]
Tags | LITHS: murolith, elliptical, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Metrics | Lith size: 9->13µm; Data source notes: lith size from OD and slightly extended |
Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, 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 romansii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1096 Go to Archive.is to create a permanent copy of this page - citation notes |