Distinguishing features: Large, narrowly elliptical, lens-shaped pontosphaerid with high rim and apparently vacant central area.
Farinacci & Howe catalog pages: Pontosphaera romansii *
Morphology remarks: 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, lenticular, narrowly-elliptical, RIM: flange-distal, outer wall acw-imbricate, CA: vacant, |
CSPH: not known, V-UNITS: outer-rim, V-prominent, R-UNITS: all, c-str, distal shield, inner-rim, px-plate, R-prominent, DETAILS: rim-bicyclic, isogyres oblique, isogyres separated,
|Metrics||Lith size: 9->13µm; |
Sources: lith size from OD and slightly extended
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:
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1096 Go to Archive.is to create a permanent copy of this page - citation notes