Taxonomy
Original description: Test flabelliform, laterally compressed, with 6-8 subglobular chambers in biserial portion; up to 10 subglobular to pyriform chambers in multiserial portion. Longitudinal costae very heavy on biserial portion; costae finer and discontinuous on multiserial portion. Sutures indistinct, depressed. Arched, basal apertures on front and back of all but outermost chambers in final row; outermost chambers with apertures on front only, facing inward.
Entries in the Catalog of original descriptions: Ventilabrella browni
Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.20-84.19Ma, base in Santonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Character matrix
test outline: | Palmate | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Multiple |
sp chamber shape: | Elongate | coiling axis: | N/A | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Elongate | umbilicus: | N/A | periph margin shape: | N/A | accessory apertures: | None |
spiral sutures: | Weakly depressed | umb depth: | N/A | wall texture: | Meridional costellae | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 6.0-10.0 | N.B. These characters are used for advanced search. N/A - not applicable |
Martin, S. E. (1972). Reexamination of the Upper Cretaceous planktonic foraminifera genera Planoglobulina and Ventilabrella Cushman. Journal of Foraminiferal Research. 2(2): 73-92. gsReferences:
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Planoglobulina browni compiled by the pforams@mikrotax project team viewed: 5-3-2021
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