Distinguishing features: Very large, elliptical with broad, high rim and narrow central opening.
Farinacci & Howe catalog pages: Pontosphaera brinkhuisii *
Morphology remarks: Very large, elliptical pontosphaerid with broad, high rim and narrow, apparently vacant central area.
Remarks: Possibly the taxon that Bralower & Mutterlose (1995) call Reticulofenestra “grandis” with a reported range of Zones NP15–16.
Differentiation: Distinguised from other Pontosphaera by larger size, thick rim cycles and vacant central area. [Bown & Newsam 2017]
Size: Holotype L = 21.2μm (Paratype L =17.1μm). [Bown & Newsam 2017]
|Tags||LITHS: murolith, elliptical, RIM: flange-distal, outer wall acw-imbricate, |
CSPH: not known, V-UNITS: outer-rim, V-prominent, R-UNITS: all, c-str, distal shield, inner-rim, px-plate, R-prominent, DETAILS: ca_conjunct, rim-bicyclic, isogyres oblique, isogyres separated,
|Metrics||Lith size: 15->22µm; |
Sources: lith size from OD and slightly extended
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian 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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