Taxonomy
Original description: Test rhomboid or fan-shaped in the adult, in the early stages biserial and in the very early stages of the microspheric form probably planispiral; chambers globular, in a single plane, early ones biserial, later ones added in series, alternating in position with the preceding ones; sutures distinct, depressed; wall calcareous, perforate, ornamented with broken, longitudinal ridges; aperture in the biserial stage in the inner margin, in the adult two openings, one on either side of the chamber near the base.
Entries in the Catalog of original descriptions: Ventilabrella eggeri, Ventilabrella eggeri glabrata, Planoglobulina transcaucasica
Character matrix
test outline: | Subtriangular | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Multiple |
sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
umb chbr shape: | Inflated | umbilicus: | N/A | periph margin shape: | Moderately rounded | accessory apertures: | N/A |
spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Finely costate | shell porosity: | - |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 3-8 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.2Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (84.19-86.71Ma, base in Coniacian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Cushman, J. A. (1928c). Foraminiferes du Stampien du Bassin de Paris. Bulletin de la Société des Sciences de Seine-et-Oise. 9: 47-63. gs Honigstein, A., Almogi-Labin, A. & Rosenfeld, A. (1987). Combined ostracod and planktonic foraminiferal biozonation of the Late Coniacian - Early Maastrichtian in Israel. Journal of Micropalaeontology. 6(2): 41-60. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs OReferences:
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Ventilabrella eggeri compiled by the pforams@mikrotax project team viewed: 8-12-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=110568 Go to Archive.is to create a permanent copy of this page - citation notes |
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